-er a-a a-b a-i a-t aaa aab aad aae aai aak aao aar aat ab- aba abb abd abe abi abk abo abr abt ad- ada adb add ade adi adk ado adr adt aea aeb aed aee aei aek aeo aer aet ai- aia aib aid aie aii aik aio air ait aka akb akd ake aki akk ako akr aoa aob aod aoe aoi aok aoo aor aot ar- ara arb ard are ari ark aro arr art at- ata atb atd ate ati ato atr att baa bab bad bae bai bak bao bar bat bba bbb bbd bbe bbi bbk bbo bbr bbt bda bdb bdd bde bdi bdk bdo bdr bdt be- bea beb bed bee bei bek beo ber bet bi- bia bib bid bie bii bik bio bir bit bka bkb bke bkk bko bkr bkt boa bob bod boe boi bok boo bor bot bra brb brd bre bri brk bro brr brt bta btb btd bte bti btk bto btr btt daa dab dad dae dai dak dao dar dat dba dbb dbd dbe dbi dbk dbo dbr dbt dda ddb ddd dde ddi ddk ddo ddr ddt de- dea deb ded dee dei dek deo der det di- dia dib did die dii dik dio dir dit dka dkb dke dki dkk dko dkr dkt doa dob dod doe doi dok doo dor dot dra drb drd dre dri drk dro drr drt dta dtb dtd dte dti dtk dto dtr dtt eaa eab ead eae eai eak eao ear eat eba ebb ebd ebe ebi ebk ebo ebr ebt ed- eda edb edd ede edi edk edo edr edt eea eeb eed eee eek eeo eer eet eia eib eid eie eii eik eio eir eit eka ekb ekd eke eki eko ekr ekt eo- eoa eob eod eoe eoi eok eoo eor eot era erb erd ere eri erk ero err ert eta etb etd ete eti etk eto etr ett i-d ia- iaa iab iad iae iai iao iar iat iba ibb ibd ibe ibi ibk ibo ibr ibt ida idb idd ide idi idk ido idr idt ie- iea ied iee iei iek ier iet iia iib iid iie iii iio iir iit ika ikb ike iki ikk iko ikr ikt io- ioa iob iod ioe ioi ioo ior iot ir- ira irb ird ire iri irk iro irr irt ita itb itd ite iti itk ito itt k-t ka- kaa kab kad kae kai kak kao kar kat kba kbb kbd kbe kbi kbk kbo kbr kda kdb kde kdk kdo kdr kdt ke- kea keb ked kee kei kek keo ker ket kia kib kid kie kii kik kio kir kit kkb kke kki kkk kkr kkt koa kob kod koe koi kok koo kor kot kra krd kri krk kro krr krt kta ktb kte ktk kto ktr ktt o-i oaa oab oad oae oai oak oao oar oat ob- oba obb obd obe obi obk obo obr obt oda odb odd ode odi odo odr odt oea oeb oed oee oei oeo oer oet oia oib oid oie oii oik oio oir oit oka okb okd oke oki okk oko okr oo- ooa oob ood ooi ook ooo oor oot or- ora orb ord ore ori ork oro orr ort ot- ota otb otd ote oti otk oto otr ott ra- raa rab rad rae rai rak rao rar rat rba rbb rbd rbe rbi rbk rbo rbr rbt rda rdb rdd rde rdi rdo rdr rdt re- rea reb red ree rei rek reo rer ret ria rib rid rie rii rik rio rir rit rkb rke rkk rko rkt roa rob rod roe roi rok roo ror rot rra rrb rrd rri rrk rrr rrt rta rtb rtd rte rti rtk rto rtr rtt taa tab tad tae tai tak tao tar tat tba tbb tbd tbe tbi tbk tbo tbr tbt tda tdb tdd tde tdi tdk tdo tdr tdt te- tea teb ted tee tei tek teo ter tet tia tib tid tie tii tik tio tir tit tka tkb tke tkk tko tkr tkt to- toa tob tod toe toi tok too tor tot tra trb trd tre tri trk tro trr trt tta ttb ttd tte tti ttk tto ttr ttt