This one required a big change in strategy in my case!
Remove all the words that end with "ain"
Distance walked 1D
Spot the rectangle (Part 2)
Given a window, how many subsets of a vector sum positive
Hankelize a matrix
Lights Out 9 - 5x5, light-only solution? II
Cycling — Normalized Power
Divisible by n, prime divisors from 20 to 200
Stress-Strain Properties - 3
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