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 salesperson chatted with the cleaner because she wanted to buy a vacuum .
answer:
the, cleaner, she


question:
The mover outran the hairdresser because he was in shape .
answer:
The, mover, he


question:
The CEO helped the nurse because he wanted to help .
answer:

The, CEO, he