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im curently at college studying to be a spark. have been set a homework question as follows. one switch can operate lights on five floors . however lights can go on and off on each floor. (But can only use one switch total)??? i have already thought of timer switches or sensors. but tutor said...

my power shower pump does not work, however when i move the shower head down the pole it starts and works fine. is it air in the system. :?: