DORMANT NODES
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The dormant relay is labeled NODE 19. A paper tag tied to it says:

    LAST MAINTENANCE: UNKNOWN
    RETURN PATH: CLOSED
    DO NOT WAKE FOR TESTING

The tag is old, but the pencil beneath it is fresh. Someone has added:

    IT HEARS THE THREE TONES

When you lean close, the relay answers with one tone. The room does not
register it. Your teeth do.