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p = l + 4
l = l
K = 2 (p+l)
= 2 ( l +4 + l)
= 2 (2l + 4)
36 = 4l + 8
36-8 = 4l
28 = 4l
l = 7
p = l + 4
= 7+4
= 11
L = p x l
= 11 x 7
= 77