There are light bulbs from A to F and bulb A is always turned on.
Bulb B repeats "it is turned on for one minute and turned off for one minute.”
Bulb C repeats"it is turned on for one minute and turned off for two minutes."
Bulb D repeats "it is turned on for one minute and turned off for three minutes."
Bulb E repeats "it is turned on for one minute and turned off for four minutes.”
Bulb F repeats "it is turned on for one minute and turned off for five minutes."
All bulbs are turned on from 10:00 to 10:01.
(1) What time is it in the status which is all bulbs are on next time?
(2) What time is it in the status which is only A,C,E are on at the first time after 10:00?
(3) What time is it in the status which is only D is off at the first time after 10:00?
(4) How many minutes are there in the status which is only A is on from 10:00 to 11:00?