this was a tough one (but all PACMAT problems are great fun!)
Set a Soroban Abacus
Back to basics 6 - Column Vector
Sum of first n terms of a harmonic progression
Flag largest magnitude swings as they occur
GJam 2013 China Event: Happy Teams
Gene Sequence Contest: Retro
Kurchan 3x3 - Optimal Score
GJam 2013 Veterans: Ocean View (Small)
GJam 2017 Kickstart: Leader (Small)
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