If       (input contains a chemistry term)

then say (Are you a chemist?)

If       (input contains a medicine term)

then say (Are you a doctor?)

          if I said (Are you a chemist?)

and the person said (Yes)

               then (#user is a chemist)

            and say (That's very interesting.)

                and (#should ask for name)

if       (#user is a chemist)

then     (#(Are you a chemist?) is a bad question)

if       (#user is not a chemist)

then     (#(Are you a chemist?) is a bad question)

If input (is X Y?)

and      (X is possibly Y)

then say (Possibly)