The keypad of a normal mobile phone is designed with alphabets 'abc' starting at key 2 and then serially following. This means the alphabet keys are not arranged according to the frequency of occurrence of the particular letter in the English language.
For example, 'e' is a letter which is used most frequently in the English language and it occurs as the 2nd letter on key 3. This makes us press the key ‘3’ twice to type 'e'.
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