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I NEED HELP WITH THIS


Im developing some project and i need advice from
mathematics experienced dudes... please let me know.  ... this is the issue:

i have   30 variables connected in pairs.. so i have 15 pairs .. some thing
like:

a1-a2 , b1-b2, c1-c2, d1-d2, e1-e2, f1-f2, g1-g2, h1-h2, i1-i2, j1-j2,
k1-k2, l1-l2,m1-m2,n1-n2,oi-o2

i need to generete as many 3 variables chains posibilities without repeating
variables or including variables of
same pair.

some thing  like

a1-b1-c1


any one has any idea?.. i need a formula for that.. i know this might be
easy for experienced mathematicians



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