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How to factorize $4x^4+12x^{10/3} y^{2/3}+ \dots $?

Does anyone know how to factorize the following expression: $$4x^4+12x^{10/3} y^{2/3}+33x^{8/3} y^{4/3}+46x^2 y^2+33x^{4/3} y^{8/3}+12x^{2/3} y^{10/3}+4 y^4$$ ?