# set up a travel network with 7 airports r 7 i 1 2 i 1 4 i 1 3 i 2 4 i 2 5 i 3 6 i 4 3 i 4 6 i 6 7 i 5 4 i 5 7 i 7 6 # the following should create errors i 8 4 i 2 9 i 12 14 # list the information for the travel network l # determine is you can travel from airport X to airport Y t 1 2 t 1 5 t 5 1 t 2 6 t 7 2 t 5 5 i 6 1 t 7 2 t 5 5 # # remove a flight and retest d 6 1 t 7 2 t 5 5 t 1 6