sample1	stage1
sample2	stage1
sample3	stage1
sample4	stage1
sample5	stage1
sample6	stage1
sample7	stage1
sample8	stage1
sample9	stage1
sample10	stage1
sample11	stage2
sample12	stage2
sample13	stage2
sample14	stage2
sample15	stage2
sample16	stage2
sample17	stage2
sample18	stage2
sample19	stage2
sample20	stage2