Question
a _____ is a list of things where each thing appears only once and Order matters
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Answer: Permutation
Permutation is a way, in which a set or number of things can be ordered or arranged. It is a listing where order matters and each thing in the list of things appears only once.
In Mathematics, permutation is the action of changing the arrangement of a set of items. .It is also called an "arrangement number" or "order