Replace NaNs with the number that appears to its left in the row.
Twins in a Window
Make a random, non-repeating vector.
Create incrementing array
Free passes for everyone!
Reverse the Words (not letters) of a String
Guess the Coefficients!
Test if two numbers have the same digits
Test if a Number is a Palindrome without using any String Operations
Return the first and last character of a string
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