instruction:
In this task, you will be given a sentence, and you need to identify the set of coreference words. Coreferences are generally a set of words in the text that refer to the same person or thing. Your output set of coreference words must be strictly present in the given input sentence. Do not use any outside knowledge to create the set of coreference words. If there is a 'the' article before the person or thing you should include 'the' as well. Please separate the coreference words by commas in the output.
question:
The librarian helped the CEO to find the book because it is her job .
answer:
The, librarian, her


question:
The driver never drove the librarian anywhere because she wore silly hats .
answer:
the, librarian, she


question:
The chief praised the accountant because he was satisfied .
answer:

The, chief, he