Trainer
Identify the signal
Play the signal and pick what it means. Answer by ear, or turn on the timeline to answer visually — both carry the same information.
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A random horn, bell, or gong signal will play. Identify what it means from four options — immediate feedback, with the rule and a link to the full entry.
Signals and meanings follow your rules setting (International) — switch it from the header at any time. Prefer to answer visually? Turn on Show timeline while answering; the pattern notation carries exactly the same information as the audio.