Too many loops and a long solution. But my brain broke down when trying to do it in 4- or 5-dimensional arrays :')
Back to basics 8 - Matrix Diagonals
intersection of matrices
Kryptos - CIA Cypher Sculpture: Vigenere Encryption
Area of an equilateral triangle
Simple return on investment
Calculate trends in time series
Find the biggest digit in a matrix
Repeat string n times - 2
Digit concentration in Champernowne's constant
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