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During what
period was the calendar invented?
In what period did the timetable initially developed?
During
what period was the schedule emerge?
At what time did the schedule firstly invented?
During what period did the agenda originally conceived?
During what period did the calendar initially created?
During what period was the timetable inception?
During what period did the timetable come about for the first time?
Calendar Ancient Egypt Solar Year Lunar Month