Structure of 1,2,3-Trifluorobenzene

How many structure isomers exist for trifluorobenzene?
There are three and they are the 1,2,3-, 1,2,4- and 1,3,5-trisubstituted isomers. Shown here is the 1,2,3-trifluorobenzene.


Figure. The RHF/6-31G* optimized structure of 1,2,3-trifluorobenzene.