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In mathematics, a sequence is an enumerated collection of objects in which repetitions are allowed. Like a set, it contains members . The number of elements is called the length of the sequence. Unlike a set, order matters, and exactly the same elements can appear multiple times at different positions in the sequence. Formally, a sequence can be defined as a function whose domain is either the set of the natural numbers or the set of the first n natural numbers . The position of an element in a sequence is its rank or index; it is the integer from which the element is the image; it depends on the context or of a specific convention, if the first element has index 0 or 1. When a symbol has been chosen for denoting a sequence, the nth element of the sequence is denoted by this symbol with n as subscript; for example, the nth element of the Fibonacci sequence is generally denoted Fn.