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What is the Morse code for SOS?
...---... The SOS signal was first adopted by the German government in 1905, and became the worldwide standard in 1908. There is no meaning behind SOS letters, they were chosen as easy to recognize.
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radio facts
How many possible code combinations are there for this kind of lock?
10000. The possible codes are from 0000 to 9999 inclusive. There are 10 possibilities for each ring, thus there are 10*10*10*10 possible codes.
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