##fileformat=VCFv4.2
##contig=<ID=chr1,length=248956422>
#CHROM	POS	ID	REF	ALT	QUAL	FILTER	INFO
chr1	100	.	AT	GT	.	.	.
chr1	0	.	A	G	.	.	.
chr1	500	.	A	-	.	.	.
chr1	600	.	A	G,GG	.	.	.
2	700	.	C	T	.	.	.