ACL-IJCNLP 2021 Submission ***. Confidential Review Copy. DO NOT DISTRIBUTE.

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Instructions for ACL-IJCNLP 2021 Proceedings

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Anonymous ACL-IJCNLP submission

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The following instructions are directed to authorsof papers submitted to ACL-IJCNLP 2021 or accepted for publication in its proceedings. All authors are required to adhere to these specifications.
Authors are required to provide a Portable Document Format (PDF) version of their papers. The
proceedings are designed for printing on A4 paper.

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This document contains the instructions for
preparing a manuscript for the proceedingsof ACL-IJCNLP 2021. The document itself
conforms to its own specifications, and istherefore an example of what your manuscript
should look like. These instructions should be
used for both papers submitted for review andfor final versions of accepted papers. Authors
are asked to conform to all the directions reported in this document.

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Introduction

Electronically-available resources

ACL provides this description and accompanying
style files at

Credits

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This document has been adapted by Roberto Navigli from the instructions for earlier ACL, NAACL
and EMNLP proceedings, including those for
EMNLP 2020 by Yulan He, ACL 2020 by Steven
Bethard, Ryan Cotterrell and Rui Yan, ACL 2019
by Douwe Kiela and Ivan Vulić, NAACL 2019
by Stephanie Lukin and Alla Roskovskaya, ACL
2018 by Shay Cohen, Kevin Gimpel, and Wei Lu,
NAACL 2018 by Margaret Michell and Stephanie
Lukin, 2017/2018 (NA)ACL bibtex suggestions
from Jason Eisner, ACL 2017 by Dan Gildea and
Min-Yen Kan, NAACL 2017 by Margaret Mitchell,
ACL 2012 by Maggie Li and Michael White, ACL2010 by Jing-Shing Chang and Philipp Koehn,
ACL 2008 by Johanna D. Moore, Simone Teufel,
James Allan, and Sadaoki Furui, ACL 2005 by
Hwee Tou Ng and Kemal Oflazer, ACL 2002 by
Eugene Charniak and Dekang Lin, and earlier ACL
and EACL formats written by several people, including John Chen, Henry S. Thompson and Donald Walker. Additional elements were taken fromthe formatting instructions of the International
Joint Conference on Artificial Intelligence and theConference on Computer Vision and Pattern Recognition.

https://2021.aclweb.org/files/

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acl-ijcnlp2021-templates.zip

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We strongly recommend the use of these style files,
which have been appropriately tailored for the ACLIJCNLP 2021 proceedings. You can also start fromthe Overleaf template linked from the conference
website.
LAT X-specific details:

The templates include
E
the LATEX2e source (acl2021.tex), the LATEX2estyle file used to format it (acl2021.sty), an ACL
bibliography style (acl natbib.bst), an example
bibliography (acl2021.bib), and the bibliography
for the ACL Anthology (anthology.bib).

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Length of Submission

The conference accepts submissions of long papers
and short papers. Long papers may consist of up
to eight (8) pages of content plus unlimited pages
for references and ethics/broader impact statement.
Short papers may consist of up to four (4) pagesof content, plus unlimited pages for references andethics/broader impact statement. Upon acceptance,
final versions of both long and short papers will be

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given one additional content page to address thereviewers’ comments.
For both long and short papers, all illustrations
and tables that are part of the main text must be
accommodated within these page limits, observing the formatting instructions given in the present
document. Papers that do not conform to thespecified length and formatting requirements
are subject to be rejected without review.
The conference encourages the submission of
additional material that is relevant to the reviewers
but not an integral part of the paper. There are twosuch types of material: appendices, which can beread, and non-readable supplementary materials,
often data or code. Additional material must be
submitted as separate files, and must adhere to thesame anonymity guidelines as the main paper. Appendices should be no longer than 4 pages. The
paper must be self-contained: it is optional for reviewers to look at the supplementary material. The
paper should not refer, for further detail, to documents, code or data resources that are not available
to the reviewers. Refer to Section 8 for further
information.
Workshop chairs may have different rules for allowed length and whether supplemental material iswelcome. As always, the respective call for papers
is the authoritative source.

Please do not include github links that reveal theauthors’ identities in your submission. If you feel
it is important to include your source code, you can
zip the code and submit it to softconf.
Once a paper has been accepted to the conference, the camera-ready version of the paper should
include the author’s names and affiliations, andis allowed to use self-references and provide therelated github link.
LATEX-specific details: For an anonymized submission, ensure that \aclfinalcopy at the top of
this document is commented out, and that you havefilled in the paper ID number (assigned during thesubmission process on softconf) where *** appears
in the \def\aclpaperid{***} definition at the topof this document. For a camera-ready submission,
ensure that \aclfinalcopy at the top of this document is not commented out.

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Anonymity

As reviewing will be double-blind, papers submitted for review should not include any author information (such as names or affiliations). Furthermore,
self-references that reveal the author’s identity, e.g.,
We previously showed (Gusfield, 1997)
...

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should be avoided. Instead, use citations such as

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Multiple Submission Policy

ACL-IJCNLP 2021 will not consider any paper thatis under review in a journal or another conferenceat the time of submission, and submitted papers
must not be submitted elsewhere during the ACLIJCNLP 2021 review period. This policy covers allrefereed and archival conferences and workshops(e.g., NAACL). The only exception is that a paper
can be dual-submitted to both ACL-IJCNLP 2021
and an ACL-IJCNLP workshop.
In addition, we will not consider any paper thatoverlaps significantly in content or results with papers that will be (or have been) published elsewhere.
Authors submitting more than one paper to ACLIJCNLP 2021 must ensure that their submissions
do not overlap significantly (> 25%) with eachother in content or results.

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Gusfield (1997) previously showed. . .

Formatting Instructions

Manuscripts must be in two-column format. Exceptions to the two-column format include the title, authors’ names and complete addresses, whichmust be centered at the top of the first page, and any
full-width figures or tables (see the guidelines in
Section 7.5). Type single-spaced. Start all pages
directly under the top margin. The manuscript
should be printed single-sided and its length should
not exceed the maximum page limit described in
Section 4. Pages should be numbered in the version submitted for review, but pages should not
be numbered in the camera-ready version.

Please do not use anonymous citations and do notinclude acknowledgements. Papers that do notconform to these requirements may be rejectedwithout review.
Any preliminary non-archival versions of submitted papers should be listed in the submission
form but not in the review version of the paper.
Reviewers are generally aware that authors may
present preliminary versions of their work in othervenues, but will not be provided the list of previous
presentations from the submission form.

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Type of Text
paper title
author names
author affiliation
the word “Abstract”
section titles
subsection titles
document text
captions
abstract text
bibliographyfootnotes

LATEX-specific details: The style files will generate page numbers when \aclfinalcopy is commented out, and remove them otherwise.
7.1

File Format

For the production of the electronic manuscript
you must use Adobe’s Portable Document Format(PDF). Please make sure that your PDF file includes all the necessary fonts (especially tree diagrams, symbols, and fonts with Asian characters).
When you print or create the PDF file, there is usually an option in your printer setup to include none,
all or just non-standard fonts. Please make surethat you select the option of including ALL thefonts. Before sending it, test your PDF by printing it from a computer different from the one
where it was created. Moreover, some word processors may generate very large PDF files, where
each page is rendered as an image. Such images
may reproduce poorly. In this case, try alternative
ways to obtain the PDF. One way on some systems
is to install a driver for a postscript printer, send
your document to the printer specifying “Output toa file”, then convert the file to PDF.
It is of utmost importance to specify the A4 format (21 cm x 29.7 cm) when formatting the paper.
Print-outs of the PDF file on A4 paper should be
identical to the hardcopy version. If you cannot
meet the above requirements about the productionof your electronic submission, please contact the
publication chairs as soon as possible.

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bold
bold
bold

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• Column height: 24.7 cm• Gap between columns: 0.6 cm

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Papers should not be submitted on any other paper
size. If you cannot meet the above requirements
about the production of your electronic submission,please contact the publication chairs above as soon
as possible.
7.3

Fonts

For reasons of uniformity, Adobe’s Times Roman
font should be used. If Times Roman is unavailable, you may use Times New Roman or Computer Modern Roman.
Table 1 specifies what font sizes and styles must
be used for each type of text in the manuscript.
LAT X-specific details:

To use Times Roman in
E
LATEX2e, put the following in the preamble:\usepackage{times}\usepackage{latexsym}

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7.4

LayoutFormat manuscripts two columns to a page, in themanner these instructions are formatted. The exact
dimensions for a page on A4 paper are:• Left and right margins: 2.5 cm• Top margin: 2.5 cm• Bottom margin: 2.5 cm

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Style
bold
bold

Table 1: Font guide.

LATEX-specific details: PDF files are usually produced from LATEX using the pdflatex command.
If your version of LATEX produces Postscript files,
ps2pdf or dvipdf can convert these to PDF. To
ensure A4 format in LATEX, use the command\special{papersize=210mm,297mm} in the LATEX
preamble (below the \usepackage commands) anduse dvipdf and/or pdflatex; or specify -t a4
when working with dvips.
7.2

Font Size
15 pt
12 pt
12 pt
12 pt
12 pt
11 pt
11 pt
10 pt
10 pt
10 pt
9 pt

• Column width: 7.7 cm

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Ruler

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A printed ruler (line numbers in the left and rightmargins of the article) should be presented in theversion submitted for review, so that reviewers may
comment on particular lines in the paper without
circumlocution. The presence or absence of theruler should not change the appearance of any othercontent on the page. The camera ready copy should
not contain a ruler.

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Reviewers: note that the ruler measurements
may not align well with lines in the paper – thisturns out to be very difficult to do well when the paper contains many figures and equations, and, when
done, looks ugly. In most cases one would expect

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Command
{\"a}
{\ˆe}
{\‘i}
{\.I}
{\o}
{\’u}
{\aa}

that the approximate location will be adequate, although you can also use fractional references (e.g.,this line ends at mark 295.5).
LATEX-specific details: The style files will generate the ruler when \aclfinalcopy is commented
out, and remove it otherwise.
7.5

Title and Authors

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7.6

Command{\c c}{\u g}{\l}{\˜n}{\H o}{\v r}{\ss}

Output
ç
ğ
ł
ñ
ő
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ß

Table 2: Example commands for accented characters,
to be used in, e.g., BIBTEX names.

Center the title, author’s name(s) and affiliation(s)across both columns. Do not use footnotes for affiliations. Place the title centered at the top of the first
page, in a 15-point bold font. Long titles should betyped on two lines without a blank line intervening.
Put the title 2.5 cm from the top of the page, followed by a blank line, then the author’s names(s),and the affiliation on the following line. Do notuse only initials for given names (middle initials
are allowed). Do not format surnames in all capitals (e.g., use “Mitchell” not “MITCHELL”). Do
not format title and section headings in all capitals
except for proper names (such as “BLEU”) thatare conventionally in all capitals. The affiliation
should contain the author’s complete address, andif possible, an electronic mail address.
The title, author names and addresses should becompletely identical to those entered to the electronical paper submission website in order to maintain the consistency of author information among
all publications of the conference. If they are different, the publication chairs may resolve the difference without consulting with you; so it is in yourown interest to double-check that the informationis consistent.
Start the body of the first page 7.5 cm fromthe top of the page. Even in the anonymous version of the paper, you should maintain space fornames and addresses so that they will fit in the
final (accepted) version.

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7.7

Text

Begin typing the main body of the text immediately
after the abstract, observing the two-column format
as shown in the present document.
Indent 0.4 cm when starting a new paragraph.

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7.8

Sections

Format section and subsection headings in the styleshown on the present document. Use numberedsections (Arabic numerals) to facilitate cross references. Number subsections with the section number and the subsection number separated by a dot,in Arabic numerals.

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7.9

Footnotes

Put footnotes at the bottom of the page and use 9
point font. They may be numbered or referred toby asterisks or other symbols.1 Footnotes should
be separated from the text by a line.2

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7.10

Graphics

Place figures, tables, and photographs in the paper
near where they are first discussed, rather than at
the end, if possible. Wide illustrations may run
across both columns. Color is allowed, but adhere
to Section 9’s guidelines on accessibility.

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Output
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ê
ı̀
İ
ø
ú
å

Abstract

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Captions: Provide a caption for every illustration; number each one sequentially in the form:“Figure 1. Caption of the Figure.” “Table 1. Caption of the Table.” Type the captions of the figures and tables below the body, using 10 point text.
Captions should be placed below illustrations. Captions that are one line are centered (see Table 1).
Captions longer than one line are left-aligned (seeTable 2).

Use two-column format when you begin the abstract. Type the abstract at the beginning of the firstcolumn. The width of the abstract text should besmaller than the width of the columns for the text
in the body of the paper by 0.6 cm on each side.
Center the word Abstract in a 12 point bold fontabove the body of the abstract. The abstract should
be a concise summary of the general thesis andconclusions of the paper. It should be no longer
than 200 words. The abstract text should be in 10
point font.

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This is how a footnote should appear.
Note the line separating the footnotes from the text.

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LATEX-specific details: The style files are compatible with the caption and subcaption packages;
do not add optional arguments. Do not override
the default caption sizes.

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7.11

Hyperlinks

Within-document and external hyperlinks are indicated with Dark Blue text, Color Hex #000099.
7.12

CitationsCitations within the text appear in parentheses
as (Gusfield, 1997) or, if the author’s name appears in the text itself, as Gusfield (1997). Append
lowercase letters to the year in cases of ambiguities.
Treat double authors as in (Aho and Ullman, 1972),
but write as in (Chandra et al., 1981) when morethan two authors are involved. Collapse multiple
citations as in (Gusfield, 1997; Aho and Ullman,
1972).
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“Gusfield (1997) showed that ...”LATEX-specific details: Table 3 shows the syntax
supported by the style files. We encourage you to
use the natbib styles. You can use the command\citet (cite in text) to get “author (year)” citations as in Gusfield (1997). You can use the command \citep (cite in parentheses) to get “(author,
year)” citations as in (Gusfield, 1997). You can use
the command \citealp (alternative cite withoutparentheses) to get “author year” citations (which
is useful for using citations within parentheses, as
in Gusfield, 1997).
7.13

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Gather the full set of references together under theheading References; place the section before any
Appendices. Arrange the references alphabeticallyby first author, rather than by order of occurrencein the text.
Provide as complete a citation as possible, using
a consistent format, such as the one for Computational Linguistics or the one in the Publication
Manual of the American Psychological Association (American Psychological Association, 1983).
Use full names for authors, not just initials.

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• Example arxiv paper: (Rasooli and Tetreault,2015).

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LATEX-specific details: The LATEX and BibTEX
style files provided roughly follow the American
Psychological Association format. If your own
bib file is named acl2021.bib, then placing thefollowing before any appendices in your LATEX file
will generate the references section for you:472

\bibliographystyle{acl_natbib}\bibliography{acl2021}

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You can obtain the complete ACL Anthology as a BibTEX file from https://aclweb.org/
anthology/anthology.bib.gz. To include boththe anthology and your own bib file, use the following instead of the above.
\bibliographystyle{acl_natbib}\bibliography{anthology,acl2021}

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• Example article in proceedings, without location: (Andrew and Gao, 2007).

write

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• Example article in journal: (Ando and Zhang,2005).

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• Example article in proceedings, with location:(Börschinger and Johnson, 2011).

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Submissions should accurately reference priorand related work, including code and data. If apiece of prior work appeared in multiple venues,
the version that appeared in a refereed, archival
venue should be referenced. If multiple versionsof a piece of prior work exist, the one used by
the authors should be referenced. Authors should
not rely on automated citation indices to provide
accurate references for prior and related work.
The following text cites various types of articles so that the references section of the present
document will include them.

References

7.14

Digital Object Identifiers

As part of our work to make ACL materials more
widely used and cited outside of our discipline,
ACL has registered as a CrossRef member, as aregistrant of Digital Object Identifiers (DOIs), thestandard for registering permanent URNs for referencing scholarly materials.
All camera-ready references are required to contain the appropriate DOIs (or, as a second resort,the hyperlinked ACL Anthology Identifier) to allcited works. Appropriate records should be foundfor most materials in the current ACL Anthology at

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Output(Gusfield, 1997)
Gusfield, 1997
Gusfield (1997)(1997)

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natbib command

Old ACL-style command

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no equivalent552\citet\newcite553\citeyearpar\shortcite

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Table 3: Citation commands supported by the style file. The style is based on the natbib package and supports all
natbib citation commands. It also supports commands defined in previous ACL style files for compatibility.

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http://aclanthology.info/. As examples, we

8.1

cite (Goodman et al., 2016) to show you how papers with a DOI will appear in the bibliography.
We cite (Harper, 2014) to show how papers without a DOI but with an ACL Anthology Identifier
will appear in the bibliography.

Appendices are material that can be read, and include lemmas, formulas, proofs, and tables that are
not critical to the reading and understanding of thepaper. In the submitted version, appendices should
be uploaded as a separate file. Submissions which
include appendices in the main paper will berejected without review. In the camera ready version, instead, appendices should directly follow the
text and the references. In all cases, appendicesshould use the same format as the main paper.

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LATEX-specific details: In your camera ready version use \appendix before any appendix section
to switch the section numbering over to letters.

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LAT X-specific details:

Please ensure that youE
use BibTEX records that contain DOI or URLs forany of the ACL materials that you reference. If the
BibTEX file contains DOI fields, the paper title in
the references section will appear as a hyperlink to
the DOI, using the hyperref LATEX package.

8

Supplementary Materials

Supplementary material may report preprocessing
decisions, model parameters, and other details necessary for the replication of the experiments reported in the paper. Seemingly small preprocessing
decisions can sometimes make a large differencein performance, so it is crucial to record such decisions to precisely characterize state-of-the-art methods.
Nonetheless, supplementary material should be
supplementary (rather than central) to the paper. Submissions that misuse the supplementary material may be rejected without review.
Supplementary material may include explanations
or details of proofs or derivations that do not fit
into the paper, lists of features or feature templates,
sample inputs and outputs for a system, hyperparameter values, pseudo-code or source code, anddata.
The paper should not rely on the supplementarymaterial: while the paper may refer to and cite
the supplementary material and the supplementarymaterial will be available to the reviewers, they will
not be asked to review the supplementary material.
Supplementary material can be uploaded as up
to three separate files: a single appendix file in PDF
format, a single .tgz or .zip archive containing software, and/or a single .tgz or .zip archive containing
data.

Appendices

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8.2

Software and Data

Submissions may include software and data usedin the work and described in the paper. Any accompanying software and/or data should include
licenses and documentation of research review as
appropriate.

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Accessibility

In an effort to accommodate people who are colorblind (as well as those printing to paper), grayscalereadability is strongly encouraged. Color is not forbidden, but authors should ensure that tables andfigures do not rely solely on color to convey criticaldistinctions. A simple criterion: All curves andpoints in your figures should be clearly distinguishable without color.

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6Translation of non-English Terms

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It is also advised to supplement non-English characters and terms with appropriate transliterations
and/or translations since not all readers understandall such characters and terms. Inline transliteration
or translation can be represented in the order of:592

original-form
transliteration“translation”

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LATEX Compilation Issues

You may encounter the following error during compilation:604\pdfendlink ended up in different nest-

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ing level than \pdfstartlink.

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This happens when pdflatex is used and a citation splits across a page boundary. To fix this,the style file contains a patch consisting of twolines: (1) \RequirePackage{etoolbox} (line 455
in acl2021.sty), and (2) A long line below (line456 in acl2021.sty).
If you still encounter compilation issues evenwith the patch enabled, disable the patch bycommenting the two lines, and then disable thehyperref package by loading the style file with
the nohyperref option:

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Then recompile, find the problematic citation, andrewrite the sentence containing the citation. (See,e.g., http://tug.org/errors.html)

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Dan Gusfield. 1997. Algorithms on Strings, Trees
and Sequences. Cambridge University Press, Cambridge, UK.

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Mary Harper. 2014. Learning from 26 languages: Program management and science in the babel program.
In Proceedings of COLING 2014, the 25th International Conference on Computational Linguistics:
Technical Papers, page 1, Dublin, Ireland. Dublin
City University and Association for Computational
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