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- (abc)de = a(bcd)e = ab(cde),
i.e. the string abcde with any three adjacent elements bracketed. n-ary associativity is a string of length n + (n − 1) with any n adjacent elements bracketed.
- Dudek, W.A. (2001), On some old problems in n-ary groups, Quasigroups and Related Systems 8: 15–36.
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