-er a-a a-b a-t aaa aab aad aae aak aan aao aar aat ab- aba abb abd abe abk abn abo abr abt ad- ada adb add ade adk adn ado adr adt aea aeb aed aee aek aen aeo aer aet aka akb akd ake akk akn ako akr an- ana anb and ane ank ann ano anr ant aoa aob aod aoe aok aon aoo aor aot ar- ara arb ard are ark arn aro arr art at- ata atb atd ate atn ato atr att baa bab bad bae bak ban bao bar bat bba bbb bbd bbe bbk bbn bbo bbr bbt bda bdb bdd bde bdk bdo bdr bdt be- bea beb bed bee bek ben beo ber bet bka bkb bke bkk bkn bko bkr bkt bna bnb bnd bne bnk bnn bno bnr bnt boa bob bod boe bok bon boo bor bot bra brb brd bre brk brn bro brr brt bta btb btd bte btk btn bto btr btt daa dab dad dae dak dan dao dar dat dba dbb dbd dbe dbk dbn dbo dbr dbt dda ddb ddd dde ddk ddn ddo ddr ddt de- dea deb ded dee dek den deo der det dka dkb dke dkk dko dkr dkt dna dnb dnd dne dnk dnn dno dnr dnt doa dob dod doe dok don doo dor dot dra drb drd dre drk drn dro drr drt dta dtb dtd dte dtk dtn dto dtr dtt eaa eab ead eae eak ean eao ear eat eba ebb ebd ebe ebk ebn ebo ebr ebt ed- eda edb edd ede edk edn edo edr edt eea eeb eed eee eek een eeo eer eet eka ekb ekd eke eko ekr ekt en- ena enb end ene enk enn eno enr ent eo- eoa eob eod eoe eok eon eoo eor eot era erb erd ere erk ern ero err ert eta etb etd ete etk etn eto etr ett k-t ka- kaa kab kad kae kak kan kao kar kat kba kbb kbd kbe kbk kbn kbo kbr kda kdb kde kdk kdo kdr kdt ke- kea keb ked kee kek ken keo ker ket kkb kke kkk kkn kkr kkt kn- kna knd kne knk knn kno knr knt koa kob kod koe kok kon koo kor kot kra krd krk krn kro krr krt kta ktb kte ktk ktn kto ktr ktt naa nab nad nae nak nan nao nar nat nba nbb nbd nbe nbk nbn nbo nbr nbt nda ndb ndd nde ndk ndn ndo ndr ndt ne- nea neb ned nee nek nen neo ner net nka nke nkk nkn nko nkr nkt nna nnb nne nnk nnn nno nnt no- noa nob nod noe nok non noo nor not nra nrb nrd nre nrk nrn nro nrr nrt nta ntb ntd nte ntk ntn nto ntr ntt oaa oab oad oae oak oan oao oar oat ob- oba obb obd obe obk obn obo obr obt oda odb odd ode odn odo odr odt oea oeb oed oee oen oeo oer oet oka okb okd oke okk oko okr on- ona onb ond one onk onn ono onr ont oo- ooa oob ood ook oon ooo oor oot or- ora orb ord ore ork orn oro orr ort ot- ota otb otd ote otk otn oto otr ott ra- raa rab rad rae rak ran rao rar rat rba rbb rbd rbe rbk rbn rbo rbr rbt rda rdb rdd rde rdn rdo rdr rdt re- rea reb red ree rek ren reo rer ret rkb rke rkk rko rkt rna rnb rnd rnn rno rnr rnt roa rob rod roe rok ron roo ror rot rra rrb rrd rrk rrn rrr rrt rta rtb rtd rte rtk rtn rto rtr rtt taa tab tad tae tak tan tao tar tat tba tbb tbd tbe tbk tbn tbo tbr tbt tda tdb tdd tde tdk tdn tdo tdr tdt te- tea teb ted tee tek ten teo ter tet tka tkb tke tkk tko tkr tkt tna tnb tnd tne tnk tnn tno tnr tnt to- toa tob tod toe tok ton too tor tot tra trb trd tre trk trn tro trr trt tta ttb ttd tte ttk ttn tto ttr ttt