[['the', ','], ['.'], ['of'], ['and'], ['to'], ['a'], ['in'], ['that'], ['is'], ['was'], ['he'], ['for'], ['``'], ["''"], ['it'], ['with'], ['as'], ['his'], ['on'], ['be'], [';'], ['at'], ['by'], ['i'], ['this'], ['had'], ['?'], ['not'], ['are'], ['but'], ['from'], ['or'], ['have'], ['an'], ['they'], ['which'], ['--'], ['one'], ['you'], ['were']]



## when you calculate the quality of clusters the only bigram combinations you have to consider are  [('the', '.'), (',' , '.') ,('.', ## 'of'), ('of','and'), ('and','to')...]
## Not all the combinations