In this task you are given a sentence. You must judge whether subject of the main clause is singular or plural. Label the instances as "Singular" or "Plural" based on your judgment.
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Question: Despair might be the tune he sang to himself about what he did, but a deep polished vanity lay beneath it.

Answer: Singular

Question: A clump of cobwebs sprouted from the rotten scalp, drifting slowly in the frozen wind.

Answer: Singular

Question: Lights flickered across her tiny shop as cars and cabs flowed by.

Answer:
Plural