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# File Doc/library/itertools.rst

` `
` **Combinatoric generators:**`
` `
`-    ==============================================   ====================       =============================================================`
`-    Iterator                                         Arguments                  Results`
`-    ==============================================   ====================       =============================================================`
`-    :func:`product`                                  p, q, ... [repeat=1]       cartesian product, equivalent to a nested for-loop`
`-    :func:`permutations`                             p[, r]                     r-length tuples, all possible orderings, no repeated elements`
`-    :func:`combinations`                             p[, r]                     r-length tuples, in sorted order, no repeated elements`
`-    |`
`-    ``product('ABCD', repeat=2)``                                               ``AA AB AC AD BA BB BC BD CA CB CC CD DA DB DC DD```
`-    ``permutations('ABCD', 2)``                                                 ``AB AC AD BA BC BD CA CB CD DA DB DC```
`-    ``combinations('ABCD', 2)``                                                 ``AB AC AD BC BD CD```
`-    ==============================================   ====================       =============================================================`
`+==============================================   ====================       =============================================================`
`+Iterator                                         Arguments                  Results`
`+==============================================   ====================       =============================================================`
`+:func:`product`                                  p, q, ... [repeat=1]       cartesian product, equivalent to a nested for-loop`
`+:func:`permutations`                             p[, r]                     r-length tuples, all possible orderings, no repeated elements`
`+:func:`combinations`                             p[, r]                     r-length tuples, in sorted order, no repeated elements`
`+|`
`+``product('ABCD', repeat=2)``                                               ``AA AB AC AD BA BB BC BD CA CB CC CD DA DB DC DD```
`+``permutations('ABCD', 2)``                                                 ``AB AC AD BA BC BD CA CB CD DA DB DC```
`+``combinations('ABCD', 2)``                                                 ``AB AC AD BC BD CD```
`+==============================================   ====================       =============================================================`
` `
` `
` .. _itertools-functions:`