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72 = 2 ( p + l )
36 = p + l
36 = p + p - 8
44 = 2p
p = 22 l = 14
K = 2(p+l)
72 = 2(p+p-8)
72 = 2(2p-8)
72/2 = 2p-8
36 = 2p-8
36+8 = 2p
44 = 2p
22 = p
l = p-8
= 22-8
= 14