5m Zen
X 3y 2 3x 5y 4
X 3y 2 3x 5y 4 pictures 5
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X 3y 2
X 3y 2 3x 5y 4
x 3y 2 3x 5y 4 by inversion method
x 3y 2 3x 5y 4 by reduction method
