a semantic relation between two events in which two events are juxtposed and the second event is unexpected. Unexpected co-occurrence is often expressed with adversative coordination. Example: Russian Vanja prostudilsja, no poshël v shkolu [Vanja caught_cold conj went to school] Vanja caught a cold, but went to school is an instance of the unexpected co-occurrence relation, using a coordinator no which is distinct from the coordinator a which is used for simple contrast. (Section 15.2.1)