flow4<A, B, C, D, E>  function 
 
- B ab(- A
 
- C bc(- B
 
- D cd(- C
 
- E de(- D
 
Implementation
E Function(A) flow4<A, B, C, D, E>(B Function(A) ab, C Function(B) bc,
        D Function(C) cd, E Function(D) de) =>
    (A a) => pipe5(a, ab, bc, cd, de);