Error in test 4.
Sorry Jean-Marie, I just corrected test 4, thanks for informing :)
Find the alphabetic word product
Extract leading non-zero digit
Count up then down
Magic is simple (for beginners)
Dimensions of a rectangle
Let's get back to school, and create multiplication tables
Who is the baby and who is the daddy in this family?
Matrix multiplication across rows
Back to basics - array operations
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