I finally figure out that you use '+length(list)' to index the second column of the list.
Construct a string from letters and counts
First non-zero element in each column
Similar Triangles - find the height of the tree
Get the length of a given vector
Choose the best fitting dominoes
Project Euler: Problem 6, Natural numbers, squares and sums.
Is this a valid Tic Tac Toe State?
Project Euler: Problem 7, Nth prime
Project Euler: Problem 3, Largest prime factor
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