Each was 300 letters long, and there wasn't a single mistake in either.

When it comes to our city's children, even a single mistake is one too many.

She wouldn't make a single mistake with her precious son.

She hadn't made a single other mistake the rest of the evening.

This was the "single biggest mistake during my years of service," he says.

How much had that single mistake cost the war effort?

"This is not a question of a single mistake," the judge said.

"A single mistake could cost you your life," he says.

One includes that making a single mistake means there's something wrong with you.

This was the single worst mistake of all my long years.