-ic a-a a-b a-c a-i a-t aaa aab aac aad aai aao aat ab- aba abb abc abd abi abo abt ac- aca acb acc acd aci aco act ad- ada adb adc add adi ado adt ai- aia aib aic aid aii aio ait aoa aob aoc aod aoi aoo aot at- ata atb atc atd ati ato att baa bab bac bad bai bao bat bba bbb bbc bbd bbi bbo bbt bca bcb bcc bcd bci bco bct bda bdb bdc bdd bdi bdo bdt bi- bia bib bic bid bii bio bit boa bob boc bod boi boo bot bta btb btc btd bti bto btt c-- caa cab cac cad cai cao cat cba cbb cbc cbd cbi cbo cbt cca ccb ccc ccd cci cco cct cda cdb cdc cdd cdi cdo cdt ci- cia cib cic cid cii cio cit co- coa cob coc cod coi coo cot cta ctb ctc ctd cti cto ctt daa dab dac dad dai dao dat dba dbb dbc dbd dbi dbo dbt dca dcb dcc dcd dci dco dct dda ddb ddc ddd ddi ddo ddt di- dia dib dic did dii dio dit doa dob doc dod doi doo dot dta dtb dtc dtd dti dto dtt i-d ia- iaa iab iac iad iai iao iat iba ibb ibc ibd ibi ibo ibt ica icb icc icd ici ico ict ida idb idc idd idi ido idt iia iib iic iid iii iio iit io- ioa iob ioc iod ioi ioo iot ita itb itc itd iti ito itt o-i oaa oab oac oad oai oao oat ob- oba obb obc obd obi obo obt oc- oca ocb occ ocd oci oco oct oda odb odc odd odi odo odt oia oib oic oid oii oio oit oo- ooa oob ooc ood ooi ooo oot ot- ota otb otc otd oti oto ott taa tab tac tad tai tao tat tba tbb tbc tbd tbi tbo tbt tca tcb tcc tcd tci tco tct tda tdb tdc tdd tdi tdo tdt tia tib tic tid tii tio tit to- toa tob toc tod toi too tot tta ttb ttc ttd tti tto ttt