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.

Within ICU notes (e.g., text example in top-left box in Figure 2), we first identify all abbreviations using regular expressions and then try to find all possible expansions of these abbreviations from domain-specific knowledge base as candidates.
Question: How do they identify abbreviations?
identify all abbreviations using regular expressions