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from itertools import permutations

def show(iterable):

first = None

for i, item in enumerate(iterable, 1):

if first != item[0]:

if first is not None:

print()

first = item[0]

print("".join(item), end=" ")

print()

print("All permutations: \n")

show(permutations("abcd"))

print("\nPairs: \n")

show(permutations("abcd", r=2))