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+6 + 7
+13
l+5 l + l -5 l
+5 + 5
+10
l (-12) + (+18) + (-6) l
I -12 +18 -6 I
I-18+18 I
I 0 I
0
l (-3) + (+17) + (-18) l
I -3 +17 -18 I
I-21 +17 I
I -4 I
4