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Related Clues:
- Strain - duty
- Make a strenuous effort
- Cause (oneself) to make a strenuous effort
- Income __
- Put out, as energy
- Apply pressure, maybe returning genealogist's work around ten
- Exercise, wield
- Wage earner's payment
- Test to the max
- Apply, as mental energy
- Use up, as energy
- Apply muscle power
- Maintain penniless specialist
- Component of some bills
- Area of expertise for a CPA