fixed bug with 3n->n3
fixed bug with 3n->n3

lauringlab/CodonShuffle,lauringlab/CodonShuffle,lauringlab/CodonShuffle,lauringlab/CodonShuffle,lauringlab/CodonShuffle,lauringlab/CodonShuffle,lauringlab/CodonShuffle,lauringlab/CodonShuffle,lauringlab/CodonShuffle,lauringlab/CodonShuffle