Series
6(2),7(10,20-22),8(5-6),9(4,8,10,25-26),10(1,5,7-11,14,24-26,28),11(3-4,7,9-10,14,16,18,20-25),12(1,3,5,7,10-13,15,17,19,21,23,25,27-28),13(5,18,20-22,24,26-27,29),14(5,7,10,12-13,15,27-28),15(1-5,7,9-15,18-19,22-26,28),16(1-9,11-13,16,18-19,23-24),17(2-6,10,13-15,22,24-26,29),18(2-7,9-11,13-16,19)