remove substrings

[ranjith kumar]

hi,
Let:
         FOURTEEN = one four
         ONE_FOURTEEN = One hundred $(FOURTEEN)
Now I want to get  a string (say RESULT) containing all the strings of
ONE_FOURTEEN (One hundred one four) - all the strings FOURTEEN(one
four).
ie) RESULT = (One hundred one four) - (one four) = One hundred

How to this kind of operation in make file, when u dont know the
strings FOURTEEN and ONE_FOURTEEN contain.
Thanks.