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| def single_number1(arr): | |
| if arr and type(arr) == 'list': | |
| vals = {} | |
| for i in arr: | |
| if i in vals: | |
| vals[i] += 1 | |
| else: | |
| vals[i] = 1 | |
| for i in arr: | |
| if arr[i] == 1: | |
| return i |
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