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).
Least common multiple of many numbers
wait for me
Unique values without using UNIQUE function
Volume difference between Ellipsoid and Sphere
Leap years on other planets
Cyclic element of
James Bond film count
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