Once and Only Once
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OAOO or Once and Only Once is an article written on [wiki.c2.com wiki.c2.com], a website dedicated to Software Engineering concepts.
My interest in OAOO was triggered by discussing it with my older son. While classifying functions, there are three generic types, injective, surjective, and bijective. In the case of bijective functions, every element in the domain must be mapped to elements in the target domain, once and only once.