surv	n	class	age	sex
20	23	0	1	0
192	862	0	1	1
1	1	1	0	0
5	5	1	0	1
140	144	1	1	0
57	175	1	1	1
13	13	2	0	0
11	11	2	0	1
80	93	2	1	0
14	168	2	1	1
14	31	3	0	0
13	48	3	0	1
76	165	3	1	0
75	462	3	1	1
