giles
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inserto a l p: p is l with a inserted at some position. Recursive: head of l first, then push past head and recurse. permuteo l p: classical recursive permutation. Empty -> empty; otherwise take a head off l, recursively permute the tail, insert head at any position in the recursive result. 7 new tests including all-6-perms-of-3 as a set check (independent of generation order). 208/208 cumulative.