Python The function values(a) gets the list a whose elements are any int numbers. The function returns the numbers of different values that can be obtained when adding any 2 elements from the list. Must not add any element to itself. Examples : values([1,3,2,2]) == 3 We can get ONLY 3 different sum values : 1+3==4, 1+2==3, 3+2==5 All other combinations will not give any other different values. values([4,4,4,4]) == 1 # whatever any 2 elements we take, we can get only the value 8. values([4]) == 0 # No any 2 elements exist in the list. we can not obtain any sum value at # all. . Complete the missing code : def values(a): return Requirements: must complete the code ONLY in the designated place AFTER the word return