-ic a-a a-b a-c a-i a-t aaa aab aac aad aai aak aat ab- aba abb abc abd abi abk abt ac- aca acb acc acd aci ack act ad- ada adb adc add adi adk adt ai- aia aib aic aid aii aik ait aka akb akc akd aki akk at- ata atb atc atd ati att baa bab bac bad bai bak bat bba bbb bbc bbd bbi bbk bbt bca bcb bcc bcd bci bck bct bda bdb bdc bdd bdi bdk bdt bi- bia bib bic bid bii bik bit bka bkb bkc bkk bkt bta btb btc btd bti btk btt c-- caa cab cac cad cai cak cat cba cbb cbc cbd cbi cbk cbt cca ccb ccc ccd cci cck cct cda cdb cdc cdd cdi cdk cdt ci- cia cib cic cid cii cik cit cka ckb ckc ckd cki ckt cta ctb ctc ctd cti ctk ctt daa dab dac dad dai dak dat dba dbb dbc dbd dbi dbk dbt dca dcb dcc dcd dci dck dct dda ddb ddc ddd ddi ddk ddt di- dia dib dic did dii dik dit dka dkb dkc dki dkk dkt dta dtb dtc dtd dti dtk dtt i-d ia- iaa iab iac iad iai iat iba ibb ibc ibd ibi ibk ibt ica icb icc icd ici ick ict ida idb idc idd idi idk idt iia iib iic iid iii iit ika ikb ikc iki ikk ikt ita itb itc itd iti itk itt k-t ka- kaa kab kac kad kai kak kat kba kbb kbc kbd kbi kbk kca kcb kcc kcd kci kck kct kda kdb kdc kdk kdt kia kib kic kid kii kik kit kkb kkc kki kkk kkt kta ktb ktc ktk ktt taa tab tac tad tai tak tat tba tbb tbc tbd tbi tbk tbt tca tcb tcc tcd tci tck tct tda tdb tdc tdd tdi tdk tdt tia tib tic tid tii tik tit tka tkb tkc tkk tkt tta ttb ttc ttd tti ttk ttt