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MINIMAL ZERO-SUM SEQUENCES OF LENGTH FOUR OVER FINITE CYCLIC GROUPS II
Let G be a finite cyclic group. Every sequence S over G can be written in the form S = (n 1 g)⋅…⋅(n l g) where g ∈ G and n 1 , …, n l ∈ [1, ord (g)], and the index ind (S) of S is defined to …