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First solution in Clear category for Non-unique Elements by DominikKossinski
#Your optional code here
#You can import some modules or create additional functions
def checkio(data):
#Your code here
#It's main function. Don't remove this function
#It's used for auto-testing and must return a result for check.
#replace this for solution
n= len (data)
i=0
while (i
Oct. 14, 2016