804. Unique Morse Code Words

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International Morse Code defines a standard encoding where each letter is mapped to a series of dots and dashes, as follows: - 'a' maps to ".-", - 'b' maps to "-...", - 'c' maps to "-.-.", and so on. For convenience, the full table for the 26 letters of the English alphabet is given below: [".-","-...","-.-.","-..",".","..-.","--.","....","..",".---","-.-",".-..","--","-.","---",".--.","--.-"

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