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Anonymous
4x2-Less likely to clog if leaves might be an issue, otherwise either will serve. However if it's large roof, go with the large size so it can handle the flow.
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2x1=2
( 3x10) + ( 2x1) = 32
CCCLXVII (100x3 + 50 + 10 + 5 + 2x1)
43-2x1 24 x3-1
it wouldn't equal anything its a prime number but of course it would be only 2x1