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[ a, b, 0, 0]
[ x, a, b, 0]
[ x, -2*x, a, b]
[-x**2, -x, x, a]
-4*a**3*(a + y) + b**2*x**2 + b**3*x**2 + 6*a**2*(a + y)**2 - 4*a*(a + y)**3 + a**4 + (a + y)**4
b**2*x**2 + b**3*x**2 + y**4
Syntax Error:
labda