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2x+4y-z=0 2x+2y-3z=0 2x+y-Z=0 x+2y-3z=0
y-z=0 y+z=0 4x+y+z=0 2x+2y-z=0
x&&y x<=y x‖y+z&&y-z !((x<&&!z‖1)
x&&y x<=y x‖y+z&&y-z !((x<y)&&!z‖1)
x&&y x<=y x y+z&&y-z !((x<y)&&!z 1)
x&&y x<=y x‖y+z&&y-z !((x<&&!z‖1)
x&&y x<=y x‖y+z&&y-z !((x<y)&&!z‖1)
2x+4y-z=0 2x+2y-3z=0 2x+y-z=0 x+2y-3z=0
x&&y x<=y x y+z&&y-z !((x<y)&&!z 1)
’x’&&’z’ (!y==1)&&(!z==0) (x1 br="">x y+y&&z-y1>
x && y x<=y x y + z &&y-z ! ((x<&&!z 1)