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+8x -1y -4z
18a - 9b - 12c
-7a + 16b +20c
15p + 16c + 32r
-17p + 1c - 31r
85f - 34b + 2c
-61f + 27b - 2c
12s - 45g -27h
15s + 34g - 1h