#Header line for a.bed
chr7	240	560	x	86	-
chr7	210	525	d	21	+
chr7	2100	2310	e	32	+
chr3	40	260	p	41	-
chr3	10	220	f	12	+
chr3	100	320	g	96	-
chr9	140	160	z	05	+
chr9	110	120	a	81	-
chr9	1100	1120	b	12	+