a-a a-b a-i a-t aaa aab aai aan aao aar aat aau ab- aba abb abi abn abo abr abt abu ai- aia aib aii ain aio air ait aiu an- ana anb ani ann ano anr ant anu aoa aob aoi aon aoo aor aot aou ar- ara arb ari arn aro arr art aru at- ata atb ati atn ato atr att atu au- aua aub aui aun auo aur aut b-u baa bab bai ban bao bar bat bau bba bbb bbi bbn bbo bbr bbt bbu bi- bia bib bii bin bio bir bit biu bna bnb bni bnn bno bnr bnt bnu boa bob boi bon boo bor bot bou bra brb bri brn bro brr brt bru bta btb bti btn bto btr btt btu bua bub bui bun buo bur but buu ia- iaa iab iai ian iao iar iat iau iba ibb ibi ibn ibo ibr ibt ibu iia iib iii iin iio iir iit iiu in- ina inb ini inn ino inr int inu io- ioa iob ioi ion ioo ior iot iou ir- ira irb iri irn iro irr irt iru ita itb iti itn ito itt itu iu- iua iub iui iur iut n-i naa nab nai nan nao nar nat nau nba nbb nbi nbn nbo nbr nbt nbu nia nib nii nin nio nir nit niu nna nnb nni nnn nno nnt nnu no- noa nob noi non noo nor not nou nra nrb nri nrn nro nrr nrt nru nta ntb nti ntn nto ntr ntt ntu nua nub nui nun nuo nur nut nuu o-i oaa oab oai oan oao oar oat oau ob- oba obb obi obn obo obr obt obu oia oib oii oin oio oir oit oiu on- ona onb oni onn ono onr ont onu oo- ooa oob ooi oon ooo oor oot or- ora orb ori orn oro orr ort oru ot- ota otb oti otn oto otr ott otu ou- oua oui oun ouo our out ra- raa rab rai ran rao rar rat rau rba rbb rbi rbn rbo rbr rbt rbu ria rib rii rin rio rir rit rna rnb rni rnn rno rnr rnt rnu roa rob roi ron roo ror rot rou rra rrb rri rrn rrr rrt rru rta rtb rti rtn rto rtr rtt rtu rua rub rui run ruo rur rut ruu taa tab tai tan tao tar tat tau tba tbb tbi tbn tbo tbr tbt tbu tia tib tii tin tio tir tit tiu tna tnb tni tnn tno tnr tnt to- toa tob toi ton too tor tot tou tra trb tri trn tro trr trt tru tta ttb tti ttn tto ttr ttt ttu tua tub tui tun tuo tur tut tuu ua- uaa uab uai uan uao uar uat uau uba ubb ubi ubn ubo ubr ubt ubu uia uib uii uin uio uir uit uiu un- una unb uni unn uno unr unt unu uoa uob uon uoo uor uot ur- ura urb uri urn uro urr urt uru uta utb uti utn uto utr utt utu uua uun uur uut uuu