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+ . - = -
- . + = -
- . - = +
12 + (+ 16)
12 + 16
28
- 8 + (- 9)
- 8 - 9
- 17
- 12 - 8
- 20
12 + (- 16)
12 - 16
- 4
15 + (+ 4)
15 + 4
19
- 12 - (- 8)
- 12 + 8
- 4
- 8 + 9
9 - 8
1
15 - (- 4)
15 + 4
19
- 1 - (- 2) - (+ 3)
- 1 + 2 - 3
2 - 4
- 2