The expression $x^{2}-4$ is a difference of squares and can be factored into $(x-2)(x+2)$. The expression $x^{2}-6x+9$ is a perfect square and can be factored into $(x-3)^{2}$. The expression $x^{2}-5x+6$ can be factored into $(x-2)(x-3)$.
So, the original
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