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You need to transmit the Morse letter D (-..) with either a fog horn or hitting a bell every 2 minutes.
Long blasts need to be 3 times as long as short blasts. The space between blasts is as long as the duration of a short blast.
So the sequence goes like this: Blow the horn or hit the bell for 6 seconds, wait for 2, hit it for 2 seconds, wait for 2 seconds, and hit it again for 2 seconds.
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