a-a a-b a-t aaa aab aaf aak aan aao aar aat aau ab- aba abb abf abk abn abo abr abt abu af- afa afb aff afk afn afo afr aft afu aka akb akk akn ako akr aku an- ana anb anf ank ann ano anr ant anu aoa aob aof aok aon aoo aor aot aou ar- ara arb arf ark arn aro arr art aru at- ata atb atf atn ato atr att atu au- aua aub auf auk aun auo aur aut b-u baa bab baf bak ban bao bar bat bau bba bbb bbf bbk bbn bbo bbr bbt bbu bfa bfb bff bfn bfo bfr bft bfu bka bkb bkf bkk bkn bko bkr bkt bna bnb bnf bnk bnn bno bnr bnt bnu boa bob bof bok bon boo bor bot bou bra brb brf brk brn bro brr brt bru bta btb btf btk btn bto btr btt btu bua bub buf buk bun buo bur but buu faa fab faf fak fan fao far fat fau fba fbb fbf fbk fbn fbo fbr fbt fbu ffa fff ffk ffn ffo ffr fft ffu fka fkb fkf fkk fkt fna fnb fnf fnk fnn fnr fnt fnu foa fob fof fok fon foo for fot fou fra frb frf frk frn fro frr frt fru fta ftb ftf ftk ftn fto ftr ftt ftu fua fub fuf fuk fun fuo fur fut fuu k-t ka- kaa kab kaf kak kan kao kar kat kau kba kbb kbf kbk kbn kbo kbr kbu kfa kff kfo kfu kkb kkk kkn kkr kkt kku kn- kna knf knk knn kno knr knt knu koa kob kof kok kon koo kor kot kou kra krf krk krn kro krr krt kru kta ktb ktf ktk ktn kto ktr ktt ktu kub kuk kun kur kut kuu naa nab naf nak nan nao nar nat nau nba nbb nbf nbk nbn nbo nbr nbt nbu nfa nfb nff nfk nfn nfo nfr nft nfu nka nkf nkk nkn nko nkr nkt nku nna nnb nnf nnk nnn nno nnt nnu no- noa nob nof nok non noo nor not nou nra nrb nrf nrk nrn nro nrr nrt nru nta ntb ntf ntk ntn nto ntr ntt ntu nua nub nuk nun nuo nur nut nuu oaa oab oaf oak oan oao oar oat oau ob- oba obb obf obk obn obo obr obt obu of- ofa ofb off ofn ofo ofr oft ofu oka okb okk oko okr oku on- ona onb onf onk onn ono onr ont onu oo- ooa oob oof ook oon ooo oor oot or- ora orb orf ork orn oro orr ort oru ot- ota otb otf otk otn oto otr ott otu ou- oua ouf ouk oun ouo our out ra- raa rab raf rak ran rao rar rat rau rba rbb rbf rbk rbn rbo rbr rbt rbu rfa rfb rff rfk rfn rfo rfr rft rfu rkb rkf rkk rko rkt rku rna rnb rnn rno rnr rnt rnu roa rob rof rok ron roo ror rot rou rra rrb rrf rrk rrn rrr rrt rru rta rtb rtf rtk rtn rto rtr rtt rtu rua rub ruf ruk run ruo rur rut ruu taa tab taf tak tan tao tar tat tau tba tbb tbf tbk tbn tbo tbr tbt tbu tfa tfb tff tfk tfn tfo tfr tft tfu tka tkb tkk tko tkr tkt tna tnb tnf tnk tnn tno tnr tnt to- toa tob tof tok ton too tor tot tou tra trb trf trk trn tro trr trt tru tta ttb ttf ttk ttn tto ttr ttt ttu tua tub tuf tuk tun tuo tur tut tuu ua- uaa uab uaf uak uan uao uar uat uau uba ubb ubf ubk ubn ubo ubr ubt ubu ufa uff ufn ufo ufr uft ufu uka ukb ukf ukk ukn ukr uku un- una unb unf unk unn uno unr unt unu uoa uob uok uon uoo uor uot ur- ura urb urf urk urn uro urr urt uru uta utb utf utk utn uto utr utt utu uua uun uur uut uuu