$$\left. \begin{array} { l } { | l | l | l | } 78 \\ + 136 , 136 , 170 \\ \end{array} \right.$$
$26520l^{3}$
$$136=2^{3}\times 17$$ $$136=2^{3}\times 17$$ $$170=2\times 5\times 17$$
$$26520l^{3}$$
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$78l^{3},\ 136,\ 136,\ 170$
