Natural language often involves an implicit time sequence.

It was a dark and stormy night.
A shot rang out.
John opened the door and saw the body.

• Time sequence: John heard the shot, then opened the door, then saw the body.

• What is true at different times: it is still a dark and stormy night, but the shot can no longer be heard.

• Causal sequence: John opened the door because he heard the shot. (A backward inference: we know John opened the door, so we presume he heard the shot.)

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