$$205C { M }^{ 2 } \times 3CM$$
$615C^{2}M^{3}$
$$205^{1}C^{1}M^{2}\times 3^{1}C^{1}M^{1}$$
$$205^{1}\times 3^{1}C^{1}C^{1}M^{2}M^{1}$$
$$205^{1}\times 3^{1}C^{1+1}M^{2+1}$$
$$205^{1}\times 3^{1}C^{2}M^{2+1}$$
$$205^{1}\times 3^{1}C^{2}M^{3}$$
$$615C^{2}M^{3}$$
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$1230CM^{3}$
