Num. seen sequences:	888
Num. observed pairs:	418387

SS	0.777669956284493	325367
ST	0.0100720146658476	4214
TS	0.0100481133496022	4204
TT	0.202209915700058	84602
BS	0.98536036036036	875
BT	0.0146396396396396	13