[Retros] Add units: 16th update

Mu-Tsun Tsai tsai39 at illinois.edu
Tue Jun 7 13:23:47 EDT 2011

Here's a N12Ai problem that uses 20 pieces. Although a 20 piece N12Ai
problem can also be easily obtained by modifying Le Gleuher's N16Ai problem,
but this one reduces the number of officers.

Stip: Add 12 units.


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