m⁴+m²n²-m²n-n³-m³+mn-mn²=-n⁴
m⁴+m²n²-m²n-n³-m³+mn-mn²+n⁴=1
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m⁴+m²n²-m²n-n³-m³+mn-mn²=-n⁴
m⁴+m²n²-m²n-n³-m³+mn-mn²+n⁴=1