[Haskell-beginners] function nesting again

[Zbigniew Stanasiuk]

Hallo all,

I have two functions f and g of one arguments:

f :: (Num a) => [a] -> [a]
g :: (Num a) => [a] -> [a]

I can do composition (f .f .f.) [a] or (g .g .g.) [a] for a few repeated 
functions.
And what about if I want to nest f, say, many many times?

The matter is more complicated (from my prespective :-) ) if I would like to 
get  e.g.:
the composition (g .f .g. g.f .f) [a]
if t == 0 then f else g  
and having the list [1,0,1,1,0,0]  as a pattern to construct above composition.

How to make above, generally for arbitrary length ???