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First solution in Clear category for Non-unique Elements by MaciejKrasny
#Your optional code here
#You can import some modules or create additional functions
def checkio(data):
#nowa lista, do której dodam elementy więcej niż 1
nowa=[]
for i in data:
if data.count(i)>1:
nowa.append(i)
return nowa
Oct. 15, 2016
