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        def permutations(x):
    # Return a list of all permutations of list x.
    n = len(x)
    if n <= 1:
        return [x]
    result = []
    x0 = x[0]
    for i in range(n):
        # Build the (n-1)! permutations with x[i] in the first position.
        xcopy = x[:]
        first, xcopy[i] = xcopy[i], x0
        result.extend([[first] + p for p in permutations(xcopy[1:])])
    return result

src/b/t/BTrees-4.0.8/BTrees/tests/testBTrees.py   BTrees(Download)
import unittest
from BTrees.tests.common import permutations
        from BTrees.check import check
        t, keys = self._build_degenerate_tree()
        for oneperm in permutations(keys):
            t, keys = self._build_degenerate_tree()
            for key in oneperm: