Is the following routing allowed?

JNB-FRA-ZRH-FRA-CAI-MUC-FRA-LAX-HKG-BKK-SIN-JNB ?

FRA is always used as a transfer point. I'm asking, because travel starts in africa goes to Europe (stop-over) goes back to Africa (CAI for a stop-over) and then comes back to Europe again for a stop-over.

Your help is greatly appreciated. :-)

[This message has been edited by garfield5 (edited 03-13-2003).]