In one book I found all three of these phrases:
if and when
any and all
either or both
Each of these phrases can be replaced by one word:
If and when: If
Any and all: Any
Either or both: Either
If and when I go to the store I will buy you a coke.
If I go to the store I will buy you a coke.
Subject must surrender any and all guns.
Subject must surrender any guns.
If either or both knew about it the story would be different.
If either knew about it the story would be different.
These words include the other. It is just habit that makes people use such terms. Let's think about what we write.