Find the numeric mean of the prime numbers in a matrix.
Back to basics 25 - Valid variable names
Generate a NaN...on purpose
Matrix to column conversion
Pi Digit Probability
It dseon't mettar waht oedrr the lrettes in a wrod are.
Remove all the consonants
Get the area codes from a list of phone numbers
Replace NaNs with the number that appears to its left in the row.
Find state names that start with the letter N
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