-ic a-a a-b a-c a-i a-t aaa aab aac aae aai aak aat ab- aba abb abc abe abi abk abt ac- aca acb acc ace aci ack act aea aeb aec aee aei aek aet ai- aia aib aic aie aii aik ait aka akb akc ake aki akk at- ata atb atc ate ati att baa bab bac bae bai bak bat bba bbb bbc bbe bbi bbk bbt bca bcb bcc bce bci bck bct be- bea beb bec bee bei bek bet bi- bia bib bic bie bii bik bit bka bkb bkc bke bkk bkt bta btb btc bte bti btk btt c-- caa cab cac cae cai cak cat cba cbb cbc cbe cbi cbk cbt cca ccb ccc cce cci cck cct ce- cea ceb cec cee cei cek cet ci- cia cib cic cie cii cik cit cka ckb ckc cki ckt cta ctb ctc cte cti ctk ctt eaa eab eac eae eai eak eat eba ebb ebc ebe ebi ebk ebt ec- eca ecb ecc ece eci eck ect eea eeb eec eee eek eet eia eib eic eie eii eik eit eka ekb ekc eke eki ekt eta etb etc ete eti etk ett ia- iaa iab iac iae iai iat iba ibb ibc ibe ibi ibk ibt ica icb icc ice ici ick ict ie- iea iec iee iei iek iet iia iib iic iie iii iit ika ikb ikc ike iki ikk ikt ita itb itc ite iti itk itt k-t ka- kaa kab kac kae kai kak kat kba kbb kbc kbe kbi kbk kca kcb kcc kce kci kck kct ke- kea keb kec kee kei kek ket kia kib kic kie kii kik kit kkb kkc kke kki kkk kkt kta ktb ktc kte ktk ktt taa tab tac tae tai tak tat tba tbb tbc tbe tbi tbk tbt tca tcb tcc tce tci tck tct te- tea teb tec tee tei tek tet tia tib tic tie tii tik tit tka tkb tkc tke tkk tkt tta ttb ttc tte tti ttk ttt