CAAAAAAAAAAA
CA->CB
CBA->CAB
CBBA->CAAB
CBBBA->CAAAB
CBBBBA->CAAAAB
CBBBBBA->CAAAAAB
CBBBBBBA->CAAAAAAB
CBBBBBBBA->CAAAAAAAB
CBBBBBBBBA->CAAAAAAAAB
CBBBBBBBBBA->CAAAAAAAAAB
CBBBBBBBBBBA->CAAAAAAAAAAB
CBBBBBBBBBBB->CAAAAAAAAAAA