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# Write the negation of "All cats scratch."

$\begin{array}{1 1}\text{ There exist a cat which does not scratch.} \\ \text{ No cats scratch} \\ \text{No cats do not scratch} \\ \text{There exist no cats which does not scratch.}\end{array}$

The given statement is
"All cats scratch."
The negation of this statement is
There exist a cat which does not scratch.