A sales representative who lives in city A wishes to start from home and visit 33 different cities: cities Upper B comma Upper C comma and Upper DB, C, and D. She must choose either to drive her own car commacar, take trains comma take buses comma ortake trains, take buses, or fly. If all cities are interconnected by roads commaroads, railways comma bus routes comma andrailways, bus routes, and airlines, how many travel plans can be constructed to visit each city exactly once and return home?