a = 2
b = 3
r = a - b
s = (a/2) - (b/2)
l = (a/2) + (b/2)
square = {
a: [0, 0, s, s],
b: [l, 0, b, s],
c: [0, l, s, r],
d: [l, l, r, r]
}
alert (square[a][3])
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