-er b-u bbb bbe bbi bbo bbr bbt bbu be- beb bee bei beo ber bet beu bi- bib bie bii bio bir bit biu bob boe boi boo bor bot bou brb bre bri bro brr brt bru btb bte bti bto btr btt btu bub bue bui buo bur but buu ebb ebe ebi ebo ebr ebt ebu eeb eee eeo eer eet eib eie eii eio eir eit eiu eo- eob eoe eoi eoo eor eot eou erb ere eri ero err ert eru etb ete eti eto etr ett etu eu- eub eue eui eur eut ibb ibe ibi ibo ibr ibt ibu ie- iee iei ier iet iib iie iii iio iir iit iiu io- iob ioe ioi ioo ior iot iou ir- irb ire iri iro irr irt iru itb ite iti ito itt itu iu- iub iue iui iur iut o-i ob- obb obe obi obo obr obt obu oeb oee oei oeo oer oet oib oie oii oio oir oit oiu oo- oob ooi ooo oor oot or- orb ore ori oro orr ort oru ot- otb ote oti oto otr ott otu ou- oue oui ouo our out rbb rbe rbi rbo rbr rbt rbu re- reb ree rei reo rer ret reu rib rie rii rio rir rit rob roe roi roo ror rot rou rrb rri rrr rrt rru rtb rte rti rto rtr rtt rtu rub rue rui ruo rur rut ruu tbb tbe tbi tbo tbr tbt tbu te- teb tee tei teo ter tet teu tib tie tii tio tir tit tiu to- tob toe toi too tor tot tou trb tre tri tro trr trt tru ttb tte tti tto ttr ttt ttu tub tue tui tuo tur tut tuu ubb ube ubi ubo ubr ubt ubu ueb uee uei uer uet uib uie uii uio uir uit uiu uob uoe uoo uor uot ur- urb ure uri uro urr urt uru utb ute uti uto utr utt utu uue uur uut uuu

bbbb bbeb bbet bebb bebe bebi bebo beeb beer beet beir beit beo- beor beot bere beri bero berr bert beru bete beti beto bett betu beur bibb bibe bibi bibo bieb bier biet bieu bio- bioi biot biou birb bire biri biro birr birt biru bite bito bitt bitu bobb bobe bobi bobo bobu boee boeo boer boet boi- boie boii boit boiu boob booe boor boot bor- bore bori boro borr bort boru botb bote boti boto bott boue bour bout breb bree brei breo brer bret brie brio brit brob broe broo bror brot brou brrr brue brut btie btob btor btrt bttb bubb bube bubi bubo bubu buer bueu buie buir buit buiu bur- burb bure buri buro burr burt buru but- bute buti buto butt ebbo ebbr eber ebit eboe eboo ebor ebro ebru ebur eeee eero eete eetu eiei eier eiou eire eitb eiti eito eitr eoir eore eori eoto erbb erbe ereb erei erer eret erie erio erit eriu erob eroe eroi eroo erre erro ertu erub erur etbr etee eter etio etoe etre etro ette etti etto ettu etui eubi euer euoi eur- eure euro eurt i-be ibet ibie ibot ibri ibro ibtb ieet ieie ieio iere ieri iett iiie iiii iiio iiit iioi iioo iitr iitt iobi ioee ioii ioio ioit iooi iooo iore iori iote ioto irbe iree irer iri- irie irio irob irre irri irte irti itbe iter itet itie itoi itoo itor itou itri itto itur iuiu o-eo obbo ober obet obie obit oboe oboi obor obot obre obri obro oere oeti oier oiii oire oirt oiti oobe oobi ooer oooo oore oort ootb orbb orbe orbi orbo orbu ore- oreb oreo orer ori- orie orio orit oro- oroe oror orot orri orro orte orto orub otee oter otit oto- otoe otoo otor otre otro otte otti otto ottu otur ouer ouie ouii ouir ouit our- oure ouro ourt out- outb oute outi outo ouu- rbbb rbbr rebb rebe rebo rebu reeb reet reii reir reit reiu reot reou rere reri rero rert reru rete reti reto retr rett reue reut reuu rib- ribe ribo ribu rier riet rieu riot riou rire riri rite riti rito ritt ritu riue rob- robb robe robi robo robt robu roer roet roio roir roit roiu roob rooi roor root rore rori roro rort roru rote roti roto rotr rott roub roue rout rrrr rtee rtei rubb rube rubi rubu ruer ruet ruit rure ruri ruro ruru rute ruti ruto rutt rutu tbit tbrb tebo tebu teer teet teie teir teiu teor ter- tere teri tero terr teru tete teti teto tetr tett tetu teut tibi tibu tie- tiee tiei tieo tier tiet tiit tiiu tiou tirb tire tiri tiro tirr tiru tite titi tito titt titu tobe tobi tobo tobt tobu toee toei toer toet toie toit toor toot tore tori toro torr tort toru tote toti toto totr tott toui tour tout tre- tree trei treo tret treu tri- trib trie trio trit troe troi troo trot trou trte trtr trub true trut truu ttbb tteo tter ttoe tttt tubb tube tubo tubr tubu tuei tuer tuet tuit tuiu tuor turb ture turi turo turr turt turu tute tuti tuto tutt tutu tuuo u-ie ubbe ubbi ubbo uber ubet ubii ubir ubit ueir uirr uor- uore urbe urbi ure- uret urib urie uriu uro- uroo urre urri urte urur urut uter utor utri utti utto uttu uuri uuuu

-tree bbbee be-er be-ro beber bebot bebti beebe beeri beete beeut beibi beier beire beite beoir beote beour berbe berei beret berie berio berit beriu berob beroe beror berre berri berru berte berti berto betee beter betie betio betoo betor betou betre bett- bette betti betto beuer beure beute bibbe bibbo biber bibie bibio bibri biebe biere bieri biert bieti biore bioue birie birou birur biter bitit bitru bitte bitti bitto biure bo-bo bobbi bobet bobr bobre bobri boero boeur boibe boier boire boiro