a-a a-b a-i a-t aaa aab aad aai aak aao aar aat ab- aba abb abd abi abk abo abr abt ad- ada adb add adi adk ado adr adt ai- aia aib aid aii aik aio air ait aka akb akd aki akk ako akr aoa aob aod aoi aok aoo aor aot ar- ara arb ard ari ark aro arr art at- ata atb atd ati ato atr att baa bab bad bai bak bao bar bat bba bbb bbd bbi bbk bbo bbr bbt bda bdb bdd bdi bdk bdo bdr bdt bi- bia bib bid bii bik bio bir bit bka bkb bkk bko bkr bkt boa bob bod boi bok boo bor bot bra brb brd bri brk bro brr brt bta btb btd bti btk bto btr btt daa dab dad dai dak dao dar dat dba dbb dbd dbi dbk dbo dbr dbt dda ddb ddd ddi ddk ddo ddr ddt di- dia dib did dii dik dio dir dit dka dkb dki dkk dko dkr dkt doa dob dod doi dok doo dor dot dra drb drd dri drk dro drr drt dta dtb dtd dti dtk dto dtr dtt i-d ia- iaa iab iad iai iao iar iat iba ibb ibd ibi ibk ibo ibr ibt ida idb idd idi idk ido idr idt iia iib iid iii iio iir iit ika ikb iki ikk iko ikr ikt io- ioa iob iod ioi ioo ior iot ir- ira irb ird iri irk iro irr irt ita itb itd iti itk ito itt k-t ka- kaa kab kad kai kak kao kar kat kba kbb kbd kbi kbk kbo kbr kda kdb kdk kdo kdr kdt kia kib kid kii kik kio kir kit kkb kki kkk kkr kkt koa kob kod koi kok koo kor kot kra krd kri krk kro krr krt kta ktb ktk kto ktr ktt o-i oaa oab oad oai oak oao oar oat ob- oba obb obd obi obk obo obr obt oda odb odd odi odo odr odt oia oib oid oii oik oio oir oit oka okb okd oki okk oko okr oo- ooa oob ood ooi ook ooo oor oot or- ora orb ord ori ork oro orr ort ot- ota otb otd oti otk oto otr ott ra- raa rab rad rai rak rao rar rat rba rbb rbd rbi rbk rbo rbr rbt rda rdb rdd rdi rdo rdr rdt ria rib rid rii rik rio rir rit rkb rkk rko rkt roa rob rod roi rok roo ror rot rra rrb rrd rri rrk rrr rrt rta rtb rtd rti rtk rto rtr rtt taa tab tad tai tak tao tar tat tba tbb tbd tbi tbk tbo tbr tbt tda tdb tdd tdi tdk tdo tdr tdt tia tib tid tii tik tio tir tit tka tkb tkk tko tkr tkt to- toa tob tod toi tok too tor tot tra trb trd tri trk tro trr trt tta ttb ttd tti ttk tto ttr ttt