uJames Allen defined a complete set of relations on time intervals
Precedes: || End-1 < Start-2
||
Meets: || End-1 = Start-2
||
Overlaps: || Start-1 < Start-2 < End-1
||
Costarts: || Start-1 = Start-2
||
During: || Start-2
< Start-1
|| End-1 < End-2
Cofinishes: || End-1 = End-2
||
Equal