I need help with SYNTAX DIAGRAM for (d), (e), and (f)

Here is an example of what I am looking for:

1. Write the syntax definitions of the following objects: (a) Natural number (1, 2, 3, ...) (b) Unsigned integer (0, 1, 2, 3, ...) (c) Integer (..., -2, -1,0, 1, 2, ...) (d) Odd number (..., -3, -1, 1, 3, ...) (e) Even number (..., -4, -2,0, 2, 4, ...) (f) Integer divisible by 5 (..., -10,-5, 0, 5, 10, ...) Signed_integers Digits