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Use "dirtier" in a sentence
"I don't use themthat often, but in dirtier water they come in handy."
"Look at Frisco, the labor leaders doin 'dirtier polities than the old parties, pawin' an 'squabblin' over graft, an 'goin' to San Quentin, while -- what are the Frisco carpenters doin '?"
"A: All one needs to do to assess whether one side fights dirtier is to review the latest and best dirty tricks of the current election cycle."