1.

\begin{array} { l } { ( x + 3 ) ( x + 7 ) } \\ { ( 4 x - 5 ) ( 4 x - 1 ) } \\ { ( 2 x + 5 y ) ( 2 x + 3 y ) } \\ { ( x y z - 4 ) ( x y z - 2 ) } \end{array}

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