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4a + 4b + 4c = 32
4 x 4 + 4 x 1 + 4 x c = 32
16 + 4 + 4c = 32
4c = 32 - 20
4c = 12
c = 3
P = 2ab + 2ac +2bc
P = 2x4x1 + 2x4x3 + 2x1x3 = 8 + 24 + 6 = 38
P = 38