SETID	PID1	PID2	PID3	PID4
1	TS3	MS3	TH2	None
2	MH3	TH3	MS3	None
3	TH2	MH5	MS2	None
4	TS2	TH4	MH5	None
5	TS1	MS3	MS2	None
6	TS2	TH3	MS2	None
7	MH5	TS2	TH2	None
8	TH2	MS3	TS1	None
9	TH3	MH5	""	None
10	TH3	MH4	""	None