In this task, a passage will be given and the goal is to identify an event from the passage. An event is defined as a single word representing something that happened, is happening, or may happen. An event can be factual or hypothetical, positive or negative, certain or uncertain. While most events are based on verbs, an event can also be based on a noun (ex. storm, snow, rainfall) or a copula verb (is, was, been, etc.). The event must not be a pronoun or an adjective. For noun events with multiple words, use the last word in the phrase as event.

Example input: Passage: I submitted the hit. The hit was approved, and then I was paid.
Example output: approved
Example explanation: There are three events in this passage (i) submission event ("submitted") (ii) the approval event ("approved"), and (iii) the payment event ("paid"). You can use any one of them as an output.
Q: Passage: The deadlock threatens the outcome of the conference, called to spur movement toward a global trade liberalization accord and which ends Sunday. The text calls for "detailed modalities that ensure the parallel elimination of all forms of export subsidies and disciplines on all export measures with equivalent effect."
A:
deadlock