↓from,to→		A	C	G	T	total
A	0.996141	0.000533	0.000704	0.001504	182872055
C	0.000908	0.998695	0.000331	0.001015	229174841
G	0.000988	0.000330	0.998696	0.000921	230805841
T	0.001494	0.000695	0.000535	0.996010	180559854