-er a-a a-b a-i a-t aaa aab aae aai aan aao aar aat aau ab- aba abb abe abi abn abo abr abt abu aea aeb aee aei aen aeo aer aet aeu ai- aia aib aie aii ain aio air ait aiu an- ana anb ane ani ann ano anr ant anu aoa aob aoe aoi aon aoo aor aot aou ar- ara arb are ari arn aro arr art aru at- ata atb ate ati atn ato atr att atu au- aua aub aue aui aun auo aur aut b-u baa bab bae bai ban bao bar bat bau bba bbb bbe bbi bbn bbo bbr bbt bbu be- bea beb bee bei ben beo ber bet beu bi- bia bib bie bii bin bio bir bit biu bna bnb bne bni bnn bno bnr bnt bnu boa bob boe boi bon boo bor bot bou bra brb bre bri brn bro brr brt bru bta btb bte bti btn bto btr btt btu bua bub bue bui bun buo bur but buu eaa eab eae eai ean eao ear eat eau eba ebb ebe ebi ebn ebo ebr ebt ebu eea eeb eee een eeo eer eet eia eib eie eii ein eio eir eit eiu en- ena enb ene eni enn eno enr ent enu eo- eoa eob eoe eoi eon eoo eor eot eou era erb ere eri ern ero err ert eru eta etb ete eti etn eto etr ett etu eu- eua eub eue eui eun eur eut ia- iaa iab iae iai ian iao iar iat iau iba ibb ibe ibi ibn ibo ibr ibt ibu ie- iea iee iei ien ier iet iia iib iie iii iin iio iir iit iiu in- ina inb ine ini inn ino inr int inu io- ioa iob ioe ioi ion ioo ior iot iou ir- ira irb ire iri irn iro irr irt iru ita itb ite iti itn ito itt itu iu- iua iub iue iui iur iut n-i naa nab nae nai nan nao nar nat nau nba nbb nbe nbi nbn nbo nbr nbt nbu ne- nea neb nee nei nen neo ner net neu nia nib nie nii nin nio nir nit niu nna nnb nne nni nnn nno nnt nnu no- noa nob noe noi non noo nor not nou nra nrb nre nri nrn nro nrr nrt nru nta ntb nte nti ntn nto ntr ntt ntu nua nub nue nui nun nuo nur nut nuu o-i oaa oab oae oai oan oao oar oat oau ob- oba obb obe obi obn obo obr obt obu oea oeb oee oei oen oeo oer oet oia oib oie oii oin oio oir oit oiu on- ona onb one oni onn ono onr ont onu oo- ooa oob ooi oon ooo oor oot or- ora orb ore ori orn oro orr ort oru ot- ota otb ote oti otn oto otr ott otu ou- oua oue oui oun ouo our out ra- raa rab rae rai ran rao rar rat rau rba rbb rbe rbi rbn rbo rbr rbt rbu re- rea reb ree rei ren reo rer ret reu ria rib rie rii rin rio rir rit rna rnb rni rnn rno rnr rnt rnu roa rob roe roi ron roo ror rot rou rra rrb rri rrn rrr rrt rru rta rtb rte rti rtn rto rtr rtt rtu rua rub rue rui run ruo rur rut ruu taa tab tae tai tan tao tar tat tau tba tbb tbe tbi tbn tbo tbr tbt tbu te- tea teb tee tei ten teo ter tet teu tia tib tie tii tin tio tir tit tiu tna tnb tne tni tnn tno tnr tnt to- toa tob toe toi ton too tor tot tou tra trb tre tri trn tro trr trt tru tta ttb tte tti ttn tto ttr ttt ttu tua tub tue tui tun tuo tur tut tuu ua- uaa uab uae uai uan uao uar uat uau uba ubb ube ubi ubn ubo ubr ubt ubu uea ueb uee uei uen uer uet uia uib uie uii uin uio uir uit uiu un- una unb une uni unn uno unr unt unu uoa uob uoe uon uoo uor uot ur- ura urb ure uri urn uro urr urt uru uta utb ute uti utn uto utr utt utu uua uue uun uur uut uuu