C:\test>u:head 661250.dat
1_3_prtnm_1441794
1_2_tname_1441794
1_2_mrslt_1
2_3_prtnm_0133611
2_2_tname_0133611
2_2_mrslt_2
3_3_prtnm_1469079
3_2_tname_1469079
3_2_mrslt_3
4_3_prtnm_0852340
...