a-a a-b a-t aaa aab aad aak aan aao aar aat aau ab- aba abb abd abk abn abo abr abt abu ad- ada adb add adk adn ado adr adt adu aka akb akd akk akn ako akr aku an- ana anb and ank ann ano anr ant anu aoa aob aod aok aon aoo aor aot aou ar- ara arb ard ark arn aro arr art aru at- ata atb atd atn ato atr att atu au- aua aub aud auk aun auo aur aut b-u baa bab bad bak ban bao bar bat bau bba bbb bbd bbk bbn bbo bbr bbt bbu bda bdb bdd bdk bdo bdr bdt bdu bka bkb bkk bkn bko bkr bkt bna bnb bnd bnk bnn bno bnr bnt bnu boa bob bod bok bon boo bor bot bou bra brb brd brk brn bro brr brt bru bta btb btd btk btn bto btr btt btu bua bub bud buk bun buo bur but buu daa dab dad dak dan dao dar dat dau dba dbb dbd dbk dbn dbo dbr dbt dbu dda ddb ddd ddk ddn ddo ddr ddt ddu dka dkb dkk dko dkr dkt dku dna dnb dnd dnk dnn dno dnr dnt doa dob dod dok don doo dor dot dou dra drb drd drk drn dro drr drt dru dta dtb dtd dtk dtn dto dtr dtt dtu dua dub dud duk dun duo dur dut k-t ka- kaa kab kad kak kan kao kar kat kau kba kbb kbd kbk kbn kbo kbr kbu kda kdb kdk kdo kdr kdt kdu kkb kkk kkn kkr kkt kku kn- kna knd knk knn kno knr knt knu koa kob kod kok kon koo kor kot kou kra krd krk krn kro krr krt kru kta ktb ktk ktn kto ktr ktt ktu kub kud kuk kun kur kut kuu naa nab nad nak nan nao nar nat nau nba nbb nbd nbk nbn nbo nbr nbt nbu nda ndb ndd ndk ndn ndo ndr ndt ndu nka nkk nkn nko nkr nkt nku nna nnb nnk nnn nno nnt nnu no- noa nob nod nok non noo nor not nou nra nrb nrd nrk nrn nro nrr nrt nru nta ntb ntd ntk ntn nto ntr ntt ntu nua nub nud nuk nun nuo nur nut nuu oaa oab oad oak oan oao oar oat oau ob- oba obb obd obk obn obo obr obt obu oda odb odd odn odo odr odt odu oka okb okd okk oko okr oku on- ona onb ond onk onn ono onr ont onu oo- ooa oob ood ook oon ooo oor oot or- ora orb ord ork orn oro orr ort oru ot- ota otb otd otk otn oto otr ott otu ou- oua oud ouk oun ouo our out ra- raa rab rad rak ran rao rar rat rau rba rbb rbd rbk rbn rbo rbr rbt rbu rda rdb rdd rdn rdo rdr rdt rdu rkb rkk rko rkt rku rna rnb rnd rnn rno rnr rnt rnu roa rob rod rok ron roo ror rot rou rra rrb rrd rrk rrn rrr rrt rru rta rtb rtd rtk rtn rto rtr rtt rtu rua rub rud ruk run ruo rur rut ruu taa tab tad tak tan tao tar tat tau tba tbb tbd tbk tbn tbo tbr tbt tbu tda tdb tdd tdk tdn tdo tdr tdt tdu tka tkb tkk tko tkr tkt tna tnb tnd tnk tnn tno tnr tnt to- toa tob tod tok ton too tor tot tou tra trb trd trk trn tro trr trt tru tta ttb ttd ttk ttn tto ttr ttt ttu tua tub tud tuk tun tuo tur tut tuu ua- uaa uab uad uak uan uao uar uat uau uba ubb ubk ubn ubo ubr ubt ubu uda udb udd udk udn udo udr udt udu uka ukb ukk ukn ukr uku un- una unb und unk unn uno unr unt unu uoa uob uod uok uon uoo uor uot ur- ura urb urd urk urn uro urr urt uru uta utb utd utk utn uto utr utt utu uua uun uur uut uuu