sample	class
s1	3
s2	1
s3	3
s4	1
s5	3
s6	1
s7	3
s8	1
s9	3
s10	1
s11	3
s12	1
s13	3
s14	1
s15	3
s16	1
s17	2
s18	2
s19	2
s20	2
s21	2
s22	2
s23	2
s24	2
s25	2
s26	2
s27	2
s28	2
s29	3
s30	1
s31	3
s32	1
s33	3
s34	1
s35	2
s36	2
s37	2