C(16,12,2) = 3

Created by LJCR

Method of Construction: Multiple of (4,3,2) covering

 1  2  3  5  6  7  9 10 11 13 14 15 
 1  2  4  5  6  8  9 10 12 13 14 16 
 1  3  4  5  7  8  9 11 12 13 15 16