Instructions: In this task, you will be presented with a context from an academic paper and a question separated with a
. You have to answer the question based on the context.
Input: We use the following cheap ways to generate pseudo-source texts:

copy: in this setting, the source side is a mere copy of the target-side data. copy-marked: another way to integrate copies without having to deal with OOVs is to augment the source vocabulary with a copy of the target vocabulary. copy-dummies: instead of using actual copies, we replace each word with "dummy" tokens.
Question: what data simulation techniques were introduced?
Output:
copy copy-marked copy-dummies