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At first, You give the word, letter and word separator.
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Then, every letter from word have been translated into it's alphabetic position, ex:
a - 1, b - 2, z - 26
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Those letter positions will be converted into HEX value,
ex:1 = 0001, 2 = 0002, 26 = 001A
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After this, converted values will be appended to result with separators.
ex:aa bb = 0001[letter separator]0001[word separator]0002[letter separator]0002