i1 : permutations {a,b,c,d}
o1 = {{a, b, c, d}, {a, b, d, c}, {a, c, b, d}, {a, c, d, b}, {a, d, b, c}, {a, d, c, b}, {b, a, c, d}, {b, a, d, c}, {b, c, a,
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d}, {b, c, d, a}, {b, d, a, c}, {b, d, c, a}, {c, a, b, d}, {c, a, d, b}, {c, b, a, d}, {c, b, d, a}, {c, d, a, b}, {c, d,
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b, a}, {d, a, b, c}, {d, a, c, b}, {d, b, a, c}, {d, b, c, a}, {d, c, a, b}, {d, c, b, a}}
o1 : List
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