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First solution in Uncategorized category for Non-unique Elements by Adam.Michalak
from collections import Counter
def checkio(data):
"""
Don't remove this function.
It's need for check your solution
"""
for i in [x for x, y in Counter(data).items() if y == 1]:
data.remove(i)
return data
#for self-testing
if __name__ == "__main__":
assert checkio([1, 2, 3, 1, 3]) == [1, 3, 1, 3], "1st example"
assert checkio([1, 2, 3, 4, 5]) == [], "2nd example"
assert checkio([5, 5, 5, 5, 5]) == [5, 5, 5, 5, 5], "3rd example"
assert checkio([10, 9, 10, 10, 9, 8]) == [10, 9, 10, 10, 9], "4th example"
Dec. 17, 2015
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