Define a function that behaves in the same way as mean(x) and mean(x,d) except that it ignores NaNs (unless all of the values being averaged are NaNs, in which case the result for those values should be NaN).
Find state names that end with the letter A
Multiply a column by a row
Calculate the Hamming distance between two strings
Is it an Armstrong number?
Leap years on other planets
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