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Paths extendable to cycles

Let k be a positive integer, and S a nonempty set of positive integers. Suppose that G is a connected graph containing a path of length k, and that each path P of length k in G is contained in some cycle C(P) of length s ∈ S. We prove that every path of length less than k can be extended to a path of length k in G. This result answers conjectures of Entringer and Reid regarding when certain paths may be extended to cycles.