1)(aa)∗(bb)∗+∗(bb)∗(aa){\displaystyle 1)(aa)*(bb)*+*(bb)*(aa)}
2)a∗(bbb)aa∗(aaa)+b∗(bbb)∗(aaa)+b∗(bbb)a∗(aaa){\displaystyle 2)a*(bbb)aa*(aaa)+b*(bbb)*(aaa)+b*(bbb)a*(aaa)}
3)∗(bbb)∗(aaa)+∗(bbb)bb∗(aaa)a+∗(bbb)b∗(aaa)aa+∗(bbb)∗(aaa)aa+∗(bbb)∗(aaa)a+∗(bbb)b∗(aaa){\displaystyle 3)*(bbb)*(aaa)+*(bbb)bb*(aaa)a+*(bbb)b*(aaa)aa+*(bbb)*(aaa)aa+*(bbb)*(aaa)a+*(bbb)b*(aaa)}
4)∗(bb)∗(aa)a+∗(bb)∗(aa)a+∗(bb)∗(aa){\displaystyle 4)*(bb)*(aa)a+*(bb)*(aa)a+*(bb)*(aa)}