a time range ?tr1 is properly included in a time range ?tr2.
(<=> (During ?Tr1 ?Tr2) (And (Tp> (Time-Range.Start-Time ?Tr1) (Time-Range.Start-Time ?Tr2)) (Tp< (Time-Range.End-Time ?Tr1) (Time-Range.End-Time ?Tr2))))
(<=> (During ?Tr1 ?Tr2) (And (Tp> (Time-Range.Start-Time ?Tr1) (Time-Range.Start-Time ?Tr2)) (Tp< (Time-Range.End-Time ?Tr1) (Time-Range.End-Time ?Tr2)))) (<=> (During= ?Tr1 ?Tr2) (Or (During ?Tr1 ?Tr2) (Starts ?Tr1 ?Tr2) (Finishes ?Tr1 ?Tr2) (Equals ?Tr1 ?Tr2)))