[RESOLVED] How do you get a unique ID from two numbers w/o ordering them?

[realMakc]

I could generate a unique number for each pair by doing (x*y)+y

suppose you have some z = (x*y)+y. then, for some x1 != x you can find y1 = z / (x1 + 1), so that x1*y1 + y1 is the same z.