$$\left. \begin{array} { l } { a \cdot \frac { 1 } { 3 } \quad 27 } \\ { 39 } \\ { 18 } \end{array} \right.$$
$234a$
$$39=3\times 13$$ $$18=2\times 3^{2}$$
$$234a$$
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$9a,\ 39,\ 18$
