$$10CM \times 6CM$$
$60\left(CM\right)^{2}$
$$10^{1}C^{1}M^{1}\times 6^{1}C^{1}M^{1}$$
$$10^{1}\times 6^{1}C^{1}C^{1}M^{1}M^{1}$$
$$10^{1}\times 6^{1}C^{1+1}M^{1+1}$$
$$10^{1}\times 6^{1}C^{2}M^{1+1}$$
$$10^{1}\times 6^{1}C^{2}M^{2}$$
$$60C^{2}M^{2}$$
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$120CM^{2}$