source code
{'AAA': 1, 'AAC': 1, 'AAG': 0.253, 'AAT': 0....
{
'
AAA
:
,
AAC
AAG
AAT
...
{'AAA': 1, 'AAC': 1, 'AAG': 0.253, 'AAT': 0.051, 'ACA': 0.076, 'ACC': 1, 'ACG': 0.099, 'ACT': 0.965, ...
ACA
ACC
ACG
ACT