C(16,9,2) <=5

Method of construction: lex covering

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