What is the sum of the smallest and the greatest four-digit numbers that can be formed by the digits 4, 0, and 5 such that the digits are not repeated more than twice?

Smallest four digit number = 4005

Sum of the digits = 4 + 0 + 0 + 5 = 9

Greatest four digit number = 5540 

Sum of the digit = 5 + 5 + 4 + 0 = 14

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