oh, remember I have a procedure including undoing it
(which is equivalent to: taking the f0 inverse of the
given f(q), this now bring us back to the lightspace
instead of pixel space).  So, even though it's not
explicity in terms of f(q), it's also in terms of
"some part of f(q)".

An example would be much clearer:
let f0(q) = a + b*q^c  be "DC solution"
now f(q) = a + b*[q*( 1 + 0.5*sin(2pi*log{q}) )]^c
is another solution
it is clear to see why both are the solution to the
comparametric equation in Q4 of the lab.

now, using my procedure:
(1/q)*f0inverse( f(q) ) will become 
1 + 0.5*sin(2pi*log{q}) 
and it is my P(Q) i suggested earlier

So, this is my understanding of Comperiodicity.
If i've misunderstood the definition of
Comperiodicity, please let me know.