-er a-a a-b a-i a-t aaa aab aae aai aar aat aau aav ab- aba abb abe abi abr abt abu abv aea aeb aee aei aer aet aeu aev ai- aia aib aie aii air ait aiu aiv ar- ara arb are ari arr art aru arv at- ata atb ate ati atr att atu atv au- aua aub aue aui aur aut auv av- ava avb ave avi avr avt avu b-u baa bab bae bai bar bat bau bav bba bbb bbe bbi bbr bbt bbu be- bea beb bee bei ber bet beu bev bi- bia bib bie bii bir bit biu biv bra brb bre bri brr brt bru brv bta btb bte bti btr btt btu btv bua bub bue bui bur but buu bva bvb bve bvi bvr bvt bvu bvv eaa eab eae eai ear eat eau eav eba ebb ebe ebi ebr ebt ebu ebv eea eeb eee eer eet eev eia eib eie eii eir eit eiu eiv era erb ere eri err ert eru erv eta etb ete eti etr ett etu etv eu- eua eub eue eui eur eut euv eva evb eve evi evr evt evv i-v ia- iaa iab iae iai iar iat iau iav iba ibb ibe ibi ibr ibt ibu ibv ie- iea iee iei ier iet iev iia iib iie iii iir iit iiu ir- ira irb ire iri irr irt iru irv ita itb ite iti itt itu itv iu- iua iub iue iui iur iut iva ivb ive ivi ivr ivt ivu ivv ra- raa rab rae rai rar rat rau rav rba rbb rbe rbi rbr rbt rbu re- rea reb ree rei rer ret reu rev ria rib rie rii rir rit riv rra rrb rri rrr rrt rru rta rtb rte rti rtr rtt rtu rtv rua rub rue rui rur rut ruu ruv rva rvb rve rvi rvr rvt rvu rvv taa tab tae tai tar tat tau tav tba tbb tbe tbi tbr tbt tbu tbv te- tea teb tee tei ter tet teu tev tia tib tie tii tir tit tiu tiv tra trb tre tri trr trt tru trv tta ttb tte tti ttr ttt ttu ttv tua tub tue tui tur tut tuu tuv tva tvb tve tvi tvr tvt tvu ua- uaa uab uae uai uar uat uau uav uba ubb ube ubi ubr ubt ubu ubv uea ueb uee uei uer uet uia uib uie uii uir uit uiu ur- ura urb ure uri urr urt uru uta utb ute uti utr utt utu utv uua uue uur uut uuu uva uvb uve uvu uvv v-a v-e vaa vab vae vai var vat vau vav vba vbi vbr vbv vea veb vee vei ver vet veu vi- via vib vie vii vir vit viu viv vra vrb vre vri vrr vrt vru vta vtb vte vti vtr vtt vtu vtv vue vur vut vuv vva vvb vvi vvr vvt vvv