6 lines (5 with data), 232 Bytes

# Bed records with comments interspersed.
chr1	10	20	first	100	+	12	18	255,124,1	3	2,6,2	10,12,18
# the second record has a different number of fields, so though it is a valid BED record,
# this file is invalid.
chr1	100	200	second