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Help with module please


Hello,

Another list request for help.

I have three variables q, a, and b.

My list format is some set consisting of vectors of the form: {{{pi, expi},
{rval0, rval1, rval2, ..., rvaln}}}

where:
 pi = prime factor,
expi = exponent of prime factor,
and an rval vector corresponding to each {pi, expi} pair.

What I would like is a list manipulator that returns an

x = x0 + x1pi + ... + xn pi^(expi-1) (note that this sum contains expi
values)

x0 = position in rval vector which contains the value PowerMod[a,
(q-1)/pi^(1)), q]

x1 = position in rval vector which contains the value
PowerMod[((PowerMod[a, - 1, q])^x0)*b, (q-1)/pi^(2), q]

x2 = position in rval vector which contains the value
PowerMod[((PowerMod[a, - 1, q])^x1)*b, (q-1)/pi^(4), q]


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