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vnice solution in Clear category for Non-unique Elements by magda_kudrycka
def checkio(data):
tablica =[]
for i in data:
data.count(i)
if(data.count(i) != 1):
tablica.append(i)
return tablica
#Some hints
#You can use list.count(element) method for counting.
#Create new list with non-unique elements
#Loop over original list
Oct. 21, 2016