↓from,to→		A	C	G	T	total
A	0.999751	0.000067	0.000094	0.000018	25324126
C	0.000088	0.999855	0.000023	0.000099	31512827
G	0.000104	0.000023	0.999850	0.000086	31702643
T	0.000010	0.000085	0.000066	0.999748	25083267