Match the idiom with its definition:
1. a white collar a) is a manual worker, e.g. in a factory
2. a blue collar b) a worker receives payment for the number of pieces produced, not for the length of time he works.
3. working unsocial hours c) does an office job
4. on piecework d) working at inconvenient times, e.g. Sundays, at night, public holidays etc.
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