a time range ?time-range-1 ends at the same time a time range?time-range-2 starts.
(<=> (Meets ?Time-Range-1 ?Time-Range-2) (Equals (End-Time-Of ?Time-Range-1) (Start-Time-Of ?Time-Range-2)))
(<=> (Before= ?Time-Range-1 ?Time-Range-2) (Or (Before ?Time-Range-1 ?Time-Range-2) (Meets ?Time-Range-1 ?Time-Range-2))) (<=> (After= ?Time-Range-1 ?Time-Range-2) (Or (After ?Time-Range-1 ?Time-Range-2) (Meets ?Time-Range-2 ?Time-Range-1))) (<=> (Overlaps= ?Time-Range-1 ?Time-Range-2) (Or (Overlaps ?Time-Range-1 ?Time-Range-2) (Meets ?Time-Range-1 ?Time-Range-2)))