B.=ab^2+ac^2+abc+bc^2+a^2b+abc+a^2c+b^2c+abc
C.=xy(x+y)-yz(y+z)+xz(x-z)
=x^2y+xy^2-y^2z-yz^2+x^2z-xz^2
D.=xy^2+xz^2+y(z^2+x^2)+z(x^2+y^2)+2abc
=xy^2+xz^2+yz^2+x^2y+x^2z+y^2z+2abc
E.=x^3-xy^2+x^2y-y^3-yz^2+y^2z-z^3+z^3-x^2z+xz^2-x^3
=-xy^2+x^2y-yz^2+y^2z-x^2z+xz^2
F.=x^3y-x^3z+y^3(z-x)+z^3(x-y)
=x^3y-x^3z+y^3z-xy^3+xz^3-yz^3
J.=x^3z-x^3y^2+xy^3-y^3z^2+yz^3-z^5+xyz(xyz-1)
=x^3z-x^3y^2+xy^3-y^3z^2+yz^3-z^5+x^2y^2z^2-xyz