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She is proof against flattery.

The scientist meticulously proofed his hypothesis through years of rigorous experimentation.

You'll have to proportion your expenditure to your income.

With the champion injured, the dark horse became the crowd's favorite probable for the final match.

She was a problem child, always in trouble with the police.

The factorial of a number is the product of all positive integers less than or equal to that number.

Probe into the cause of the accident.