Cubics tarsia amended

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x
x
x
x
x
x
x+
x−
x
x
2
x 3 −x 2 − x+
x
x
x
2
3
x
x
x
x
x
2
3
x
x
x−
x 3 + x 2 −x−
x−
x 3− x 2+ x
x+
x
xx
ISFUN
x 3 + x 2 + x+
x+
x 3 +x 2 − x−
x+
x+
x x+
x−
x+
x+
x+
2
x+
− x−
−x 3 + x 2 −x−
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