precedes B precedes C if and only if B ends before C starts. follows Inverse relation of precedes meets B meets C if and only if B ends at the same time as C starts. metBy Inverse relation of meets overlaps B overlaps C if and only if B starts before C starts, B ends after C starts and B ends before C ends. overlappedBy Inverse relation of overlaps contains B contains C if and only if C starts after B starts and C ends at the same time as or before B ends, or C starts after or at the same time as B starts and C ends before B ends. during Inverse relation of contains strictContains B strictContains C if and only if C starts after B starts and C ends before B ends. strictDuring Inverse relation of strictContains starts B starts C if and only if B starts at the same time as C starts and B ends before C ends. startedBy Inverse relation of starts finishes B finishes C if and only if B starts after C starts and B ends at the same time as C ends. finishedBy Inverse relation of finishes coOccurs B coOccurs if and only if B starts at the same time as C starts and B ends at the same time as C ends. contiguous A1, A2, Åc An contiguous if and only if they are temporally disjoint and connected. sequential A1, A2, Åc An sequential if and only if they are temporally disjoint and not necessarily connected. coBegin A1, A2, Åc An coBegin if and only if they start at the same time. coEnd A1, A2, Åc An coEnd if and only if they end at the same time. parallel A1, A2, Åc An parallel if and only if the intersection of A1, A2, Åc An has one non-empty interior. overlapping A1, A2, Åc An overlapping if and only if the union of A1, A2, Åc An is connected and each Ai intersects at least one other Aj with non-empty interior.