Nice trick: for unsigned a,b,c, c<maxval/2, |a-b|<=c can be written as a-b+c<=2*c.
Stated more precisely, d(a,b)<=c, where d(a,b)=min(a-b,b-a), can be written as a-b+c<=2*c.
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Stated more precisely, d(a,b)<=c, where d(a,b)=min(a-b,b-a), can be written as a-b+c<=2*c.