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Randomness means different things in various fields. commonly, it means lack of pattern or predictability in events. the oxford english dictionary defines "random" as "having no definite aim or purpose; not sent or guided in a particular direction; made, done, occurring, etc. , without method or conscious choice; haphazard. " this concept of randomness suggests a non-order or non-coherence in a sequence of symbols or steps, such that there is no intelligible pattern or combination.