This should not work in general. It returns false-positive for consecutive 1 5 7 :-)
This should not work, but test suite only requires us to check for groups of three in columns.
Thanks for noticing that...I'll edit the test suite and fix that.
How to subtract?
frame of the matrix
Matrix multiplication across rows
The Hills Are Alive...
Return elements unique to either input
Generate a Parasitic Number
Two fractions, one sum
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