Guess the password or break the lock.
And this problem is much easier than others you solved here!! ;-)
Sorry, I was tempted by the 'break the lock' part... :)
Get the area codes from a list of phone numbers
Choose the best fitting dominoes
Magic is simple (for beginners)
Output any real number that is neither positive nor negative
Try 1.5.4: Celsius to Fahrenheit
Polite numbers. N-th polite number.
Another colon problem
expand intervals vol.2
Optimum Egyptian Fractions
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