a time range ?tr1 ends at the same time a time range ?tr2 starts.
(<=> (Meets ?Tr1 ?Tr2) (Tp= (Time-Range.Start-Time ?Tr1) (Time-Range.Start-Time ?Tr2)))
(<=> (Meets ?Tr1 ?Tr2) (Tp= (Time-Range.Start-Time ?Tr1) (Time-Range.Start-Time ?Tr2))) (<=> (Before= ?Tr1 ?Tr2) (Or (Before ?Tr1 ?Tr2) (Meets ?Tr1 ?Tr2))) (<=> (After= ?Tr1 ?Tr2) (Or (After ?Tr1 ?Tr2) (Meets ?Tr2 ?Tr1))) (<=> (Overlaps= ?Tr1 ?Tr2) (Or (Overlaps ?Tr1 ?Tr2) (Meets ?Tr1 ?Tr2)))