Obtain randomness for P by applying a pseudo-random function
to the input and the communication:
Pí(x,w,rí) V(x)
_1 Ö _ n
Dec(_1 Ö _n)
_1 Ö _ n
Commit(_1 Ö _n)
Fix rí =k
Run P with randomness
r = fk(x,w,com(_1 Ö _n))
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