You will be given a definition of a task first, then some input of the task.
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.

In this paper, we manually annotate the predicateargument structures for the 600 L2-L1 pairs as the basis for the semantic analysis of learner Chinese.
Question: Who manually annotated the semantic roles for the set of learner texts?
Output:
Authors