C(14,5,2) <=12

Method of construction: lex covering

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