In this task, you are given two sentences in the English language (Sentence 1 and Sentence 2). Your task is to identify the connecting word between the two sentences.

Sentence 1:Sources are also required when quoting someone , with or without quotation marks , or closely paraphrasing a source . Sentence 2:However , the citing of sources is not limited to those situations -- editors are always encouraged to add or improve citations for any information contained in an article .
however

Sentence 1:However , their stories , composed in verse form , were not written down until the subsequent Sassanian period . Sentence 2:In fact , there is no known Parthian - language literature that survives in original form , since it was written down in the following centuries .
in fact

Sentence 1:Limited computer power : There was not enough memory or processing speed to accomplish anything truly useful . Sentence 2:For example , Ross Quillian 's successful work on natural language was demonstrated with a vocabulary of only twenty words , because that was all that would fit in memory .

for example