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ON THE INDEX-CONJECTURE OF LENGTH FOUR MINIMAL ZERO-SUM SEQUENCES 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 …