distinct case-insensitive words and how many times they appear in total. Note: Do not worry about punctuations for now. "A quiet house is nice until you are ordered to stay in it for months.", "It ...
A valid postal code P have to fullfil both below requirements: - P must be a number in the range from 100000 to 999999 inclusive. - P must not contain more than one alternating repetitive digit pair.
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