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).
Which values occur exactly three times?
Test for balanced parentheses
Read a Soroban Abacus
Project Euler: Problem 10, Sum of Primes
Evaluating continued fractions
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