this was a tough one (but all PACMAT problems are great fun!)
Column norms of a matrix
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
PACMAT 04 - Optimized Ghosts, Equal Speed, 10 Lives
GJam 2014 China Rd A: Read Phone Number (Large)
GJam: 2013 Rd1a Bullseye Painting - Large Numbers
Kaggle: Reverse Game of Life - Periods of Oscillators
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