-ic bbb bbc bbe bbi bbk bbt bcb bcc bce bci bck bct be- beb bec bee bei bek bet bi- bib bic bie bii bik bit bkb bkc bke bkk bkt btb btc bte bti btk btt c-- cbb cbc cbe cbi cbk cbt ccb ccc cce cci cck cct ce- ceb cec cee cei cek cet ci- cib cic cie cii cik cit ckb ckc cki ckt ctb ctc cte cti ctk ctt ebb ebc ebe ebi ebk ebt ec- ecb ecc ece eci eck ect eeb eec eee eek eet eib eic eie eii eik eit ekb ekc eke eki ekt etb etc ete eti etk ett ibb ibc ibe ibi ibk ibt icb icc ice ici ick ict ie- iec iee iei iek iet iib iic iie iii iit ikb ikc ike iki ikk ikt itb itc ite iti itk itt k-t kbb kbc kbe kbi kbk kcb kcc kce kci kck kct ke- keb kec kee kei kek ket kib kic kie kii kik kit kkb kkc kke kki kkk kkt ktb ktc kte ktk ktt tbb tbc tbe tbi tbk tbt tcb tcc tce tci tck tct te- teb tec tee tei tek tet tib tic tie tii tik tit tkb tkc tke tkk tkt ttb ttc tte tti ttk ttt