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The 3M Company used to produce the 3M Mask. However, they sold the liquid mask name to the Trimex Company who now produces the 3M Mask and calls it Trimex Window Mask.
Minnesota Mining and Manufacturing Company
It's just 3m + 2. Now, if m stands for a particular number, it's 3 times the number, plus two.
3m*3m*2m=300*300*200=18,000,000cm3
It is 9m^2 - 9 = (3m + 3)*(3m - 3).