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If you look at the image of the Morse code alphabet, you'll see that SOS is quite easy to send, *** --- ***
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Furthermore, 3 is the common number of requests for help, three clouds of smoke, three flashes of light, three whistles, they are all SOS messages. 3 becasue, as you said, is the simplest way to shout for help
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Great to know that too
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Learned something new!!