422
-
GHI ABC ABC
T9 phone-keypad letter set per digit
-
AZZ
leet substitution: 0=O, 1=I, 3=E, 4=A, 5=S, 7=T, etc.
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2 × 211
prime factorization
GHI ABC ABC
T9 phone-keypad letter set per digit
AZZ
leet substitution: 0=O, 1=I, 3=E, 4=A, 5=S, 7=T, etc.
2 × 211
prime factorization