IBD 6.0: Construct an IBD of size (v,k,r)
(c) 2007 Design Computing (designcomputing.net/)

Note: Best  IBD of size (v,k,r)=(60,9,3)

try #     	2
seed      	-1732060177
# of iterations	57
E         	0.8786
E/U       	1
concurrences	0(1050) 1(720) 

Plan (blocks are rows):

47	35	24	2	21	32	6	48	44	
56	38	59	10	11	22	13	44	0	
22	26	47	5	39	1	41	9	31	
31	25	3	12	40	17	13	23	6	
56	47	8	58	12	14	19	54	27	
37	40	26	44	4	14	51	7	28	
20	7	43	42	36	19	17	15	22	
20	30	48	11	25	27	49	28	9	
15	1	45	46	4	53	13	27	2	
57	31	36	10	35	30	52	45	51	
59	34	55	35	16	12	1	50	20	
33	25	29	54	2	7	0	57	34	
42	8	52	55	33	38	21	40	9	
42	54	24	5	23	10	37	16	46	
19	38	29	4	6	5	50	30	18	
55	45	28	23	43	29	32	58	41	
58	26	53	49	3	59	36	33	24	
18	43	52	39	48	0	53	14	16	
57	32	39	50	3	8	37	11	15	
46	34	56	41	49	21	17	18	51	

Note: IBD used 0.031 seconds.