pipe7<A, B, C, D, E, F, G>  function 
 
- A a,
- B ab(- A
 
- C bc(- B
 
- D cd(- C
 
- E de(- D
 
- F ef(- E
 
- G fg(- F
 
Transforms the input a by applying the function ab, then bc, then cd, then de, then ef and then fg.
Implementation
G pipe7<A, B, C, D, E, F, G>(A a, B Function(A) ab, C Function(B) bc,
    D Function(C) cd, E Function(D) de, F Function(E) ef, G Function(F) fg) {
  return fg(ef(de(cd(bc(ab(a))))));
}