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Remember Pressure

is a piece of coal that stuck to the job.

A diamond is a piece of coal that stuck to the job Thomas A. Edison

is a chunk of coal that stuck to the job.

A diamond is valuable though it lie on a dunghill.

is not a girl's best friend. If they were, they'd be talking about them behind their backs.

Diamonds aren't a girl's best friend.. I've never heard my wife talking about them behind their backs.

is a bright gem, the sparkle of which sometimes renders a woman stone-blind to the effects of the man proffering it