# Addons/stats/base/combinatorial

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**stats/base/combinatorial** ` - ` Sample design

comb v combinations of size x from i.y combrep v combinations of size x from i.y with repetition combrev v comb in revolving door order perm v permutations of size y from i.y permrep v permutations of size x from i.y with repetition steps v steps from a to b in c steps

### comb

comb (v) combinations of size x from i.y

### combrep

combrep (v) combinations of size x from i.y with repetition

### combrev

combrev (v) comb in revolving door order

combinations in what Knuth calls "revolving door order" such that any two adjacent combinations differ by a single element (Gray codes for combinations).

### perm

perm (v) permutations of size x from i.y

monadic form gives all perms of size i.y (i@! A. i.)

### permrep

permrep (v) permutations of size x from i.y with repetition

### steps

steps (v) steps from a to b in c steps

form: steps a,b,c