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1] 3------2*4 5---4*6
2] 4-----3*5 5---4*6
[1]+[2]: 5---4*6 7----6*8 11-----10*12
when m is not multiple of 2, then (m+1)*(m-1)is multiple of 4.
and it seems when m is neither multiple of 2 nor multiple of 3. it appears to
be the multiple of 6........ |
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