9
((A+B-C)*D)
((A-B+C)*D)
(A+B-C*D)
(A-B+C*D)
(A+B*C)
(A*(B+C)/D-E)
(A+B*(C-D*(E-F)-G*H)-I*3)
(A+B*C/D*E-F)
(A+(B-(C+(D-(E+F)))))
(A*(B+(C*(D+(E*(F+G))))))

