aa      89620
ac      66615
at      64646
ag      58224
a^      28
ca      66609
cc      60601
ct      52921
cg      47909
c^      19
ta      64590
tc      52386
tt      75317
tg      48514
t^      19
ga      58156
gc      48340
gt      48072
gg      37817
g^      21
^a      30
^c      25
^t      18
^g      18