-er a-a a-b a-i a-t aaa aab aae aag aai aao aar aat aau ab- aba abb abe abg abi abo abr abt abu aea aeb aee aeg aei aeo aer aet aeu ag- aga agb age agg agi ago agr agt agu ai- aia aib aie aig aii aio air ait aiu aoa aob aoe aog aoi aoo aor aot aou ar- ara arb are arg ari aro arr art aru at- ata atb ate atg ati ato atr att atu au- aua aub aue aug aui auo aur aut b-u baa bab bae bag bai bao bar bat bau bba bbb bbe bbg bbi bbo bbr bbt bbu be- bea beb bee beg bei beo ber bet beu bga bgb bge bgg bgi bgo bgr bgt bgu bi- bia bib bie big bii bio bir bit biu boa bob boe bog boi boo bor bot bou bra brb bre brg bri bro brr brt bru bta btb bte btg bti bto btr btt btu bua bub bue bug bui buo bur but buu eaa eab eae eag eai eao ear eat eau eba ebb ebe ebg ebi ebo ebr ebt ebu eea eeb eee eeg eeo eer eet ega egb ege egg egi ego egr egt egu eia eib eie eig eii eio eir eit eiu eo- eoa eob eoe eog eoi eoo eor eot eou era erb ere erg eri ero err ert eru eta etb ete etg eti eto etr ett etu eu- eua eub eue eug eui eur eut gaa gab gae gag gai gao gar gat gau gba gbe gbg gbi gbo gbr gbt gbu ge- gea geb gee geg gei geo ger get geu gga ggb ggg ggi ggo ggr ggt ggu gia gib gie gig gii gio gir git giu goa gob goe gog goi goo gor got gou gra grb gre grg gri gro grr grt gru gta gtb gte gtg gti gto gtr gtt gtu gu- gua gub gue gug gui guo gur gut guu ia- iaa iab iae iag iai iao iar iat iau iba ibb ibe ibg ibi ibo ibr ibt ibu ie- iea iee ieg iei ier iet iga igb ige igg igi igo igr igt igu iia iib iie iii iio iir iit iiu io- ioa iob ioe iog ioi ioo ior iot iou ir- ira irb ire irg iri iro irr irt iru ita itb ite itg iti ito itt itu iu- iua iub iue iug iui iur iut o-i oaa oab oae oag oai oao oar oat oau ob- oba obb obe obg obi obo obr obt obu oea oeb oee oeg oei oeo oer oet oga oge ogg ogi ogo ogt oia oib oie oii oio oir oit oiu oo- ooa oob oog ooi ooo oor oot or- ora orb ore org ori oro orr ort oru ot- ota otb ote otg oti oto otr ott otu ou- oua oue oui ouo our out ra- raa rab rae rag rai rao rar rat rau rba rbb rbe rbg rbi rbo rbr rbt rbu re- rea reb ree reg rei reo rer ret reu rga rgb rge rgg rgi rgo rgr rgt ria rib rie rig rii rio rir rit roa rob roe rog roi roo ror rot rou rra rrb rrg rri rrr rrt rru rta rtb rte rtg rti rto rtr rtt rtu rua rub rue rug rui ruo rur rut ruu taa tab tae tag tai tao tar tat tau tba tbb tbe tbg tbi tbo tbr tbt tbu te- tea teb tee teg tei teo ter tet teu tga tgb tge tgg tgi tgo tgr tgt tgu tia tib tie tig tii tio tir tit tiu to- toa tob toe tog toi too tor tot tou tra trb tre trg tri tro trr trt tru tta ttb tte ttg tti tto ttr ttt ttu tua tub tue tug tui tuo tur tut tuu ua- uaa uab uae uag uai uao uar uat uau uba ubb ube ubg ubi ubo ubr ubt ubu uea ueb uee ueg uei uer uet uga ugb uge ugg ugi ugo ugr ugt ugu uia uib uie uig uii uio uir uit uiu uoa uob uoe uog uoo uor uot ur- ura urb ure urg uri uro urr urt uru uta utb ute uti uto utr utt utu uua uue uug uur uut uuu