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+6 = -4 +10
complement 5 2 digit
+4 = +5 -1 +3 = +5 -2 +2 = +5 -3 +1 = +5 -4
Complement +-10 (1 digit) (1 to 9)
complement +-5 (1digit) (1 to 4)
-4 = +1 -5 -3 = +2 -5 -2 = +3 -5 -1 = +4 -5
+3 = -7 + 10