flow3<A, B, C, D>  function 
 
- B ab(- A
 
- C bc(- B
 
- D cd(- C
 
Implementation
D Function(A) flow3<A, B, C, D>(
        B Function(A) ab, C Function(B) bc, D Function(C) cd) =>
    (A a) => pipe4(a, ab, bc, cd);D Function(A) flow3<A, B, C, D>(
        B Function(A) ab, C Function(B) bc, D Function(C) cd) =>
    (A a) => pipe4(a, ab, bc, cd);