-ic bbb bbc bbe bbi bbt bcb bcc bce bci bct be- beb bec bee bei bet bi- bib bic bie bii bit btb btc bte bti btt c-- cbb cbc cbe cbi cbt ccb ccc cce cci cct ce- ceb cec cee cei cet ci- cib cic cie cii cit ctb ctc cte cti ctt ebb ebc ebe ebi ebt ec- ecb ecc ece eci ect eeb eec eee eet eib eic eie eii eit etb etc ete eti ett ibb ibc ibe ibi ibt icb icc ice ici ict ie- iec iee iei iet iib iic iie iii iit itb itc ite iti itt tbb tbc tbe tbi tbt tcb tcc tce tci tct te- teb tec tee tei tet tib tic tie tii tit ttb ttc tte tti ttt