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X X X
X X X
X 2 3
X X X
X 2 X
X X 3
a a+d a+2d
a+c a+c+d a+c+2d
a+2c a+2c+d a+2c+2d
9a + 9d + 9c = sum
9(a+c+d) = sum
(d + a) - (a) = (a + 2d) - (a+d) = d
(a + c + d) - (a+c) = (a+c+2d)-(a+c+d)=d
(a + 2c + d) - (a+2c) = (a+2c+2d)-(a+2c+d)=d
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a a+b a+2b
a+c a+c+d a+c+2d
a+2c a+2c+e a+2c+2e
a a+b a+2b
a+c a+b+f a+2b+g
a+2c a+2b+2f a+2b+2g
a+b+2f = a+2c+e
a+b+f = a+c+d
f = c + e - d
b-2c=e-2f
-b+c=-d+f //b-c = d-f
-c = e-d-f
c=d+f-e
b = d-f+c
=d+f+d+f-e
=2d+2f-e
a+2b+2g = a+2c+2e
a+2b + g = a+c+2d
g = c+2e-2d
g = f + e - d
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