Well this one is taking a number and then summing the individual parts till you reach a value of 1, 2, 3, 4, 5, 6, 7, 8, 9, or 0 (only if the original is 0 the answer will be 0). For example:
x = [103]; So ---> 1+0+3 = 4 output = 4;
another example:
x = [99]; So ---> 9+9 = 18 ---> 1+8 = 9 output = 9;
another example:
x = [1199]; So ---> 1+1+9+9 = 20 ---> 2+0 = 2 output = 2;
another example:
x = [11 3]; So ---> 1+1 = 2 and 3 = 3 output = [2 3];
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