SML help !

Hello,

Can anyone help me on that... plsss I have to make a list..

composelist: (´ab -> ´ab)list -> ´ab -> ´ab, such that if
[f1, ..., fn] is a list of suncions of type ´ab -> ´ab and x is a value of type ´ab,  then the call composelist [f1, ..., fn] x will return the value vf1(f2(... fn-1(fn(x)))).
In the case where n = 0 (the list of dunction is empty) composelist [] x should return x.

composelist [fn y => Y*Y, fn z => z+1, fn w => div 2] 4

should return the value 9 (= ((4div2)+1)* ((4div2)+1)).

Thanks in advance...