bbbb bbeb bbet bebb bebe bebi bebo beeb beek beer beet beik beir beit beke beki beko beo- beok beor beot bere beri berk bero berr bert bete beti beto bett bibb bibe bibi bibo bieb bier biet bike biko bio- bioi biot birb bire biri birk biro birr birt bite bito bitt bobb bobe bobi bobo boee boeo boer boet boi- boie boii boit boke boki boko boob booe book boor boot bor- bore bori bork boro borr bort botb bote boti boto bott breb bree brei brek breo brer bret brie brik brio brit brkb brob broe brok broo bror brot brrr btek btie btob btor btrt bttb ebbo ebbr eber ebit eboe eboo ebor ebro eeee eeke eero eete eiei eier eike eiki eiko eire eitb eiti eito eitr ekeb ekek eker eket ekki ekoi eoir eore eori eoto erbb erbe ereb erei erer eret erie erik erio erit erke erki erob eroe eroi eroo erre erro etbr etee eter etik etio etoe etok etre etro ette etti etto i-be ibet ibie ibot ibri ibro ibtb ieet ieie ieio iere ieri iett iiie iiii iiio iiit iioi iioo iitr iitt ikee iker ikki ikko ikoo ikri iobi ioee ioii ioio ioit ioke ioko iooi iooo iore iori iote ioto irbe iree irer iri- irie irio irki irob irre irri irte irti itbe itek iter itet itie itko itoi itoo itor itri itto kbbb kbbe kbbi kbbk kbbo kbbr kbbt kbeb kbee kbek kbeo kber kbet kbib kbie kbik kbio kbit kbkb kbkk kbko kbkr kbob kboe kboi kbok kboo kbot kbrb kbre kbri kbrk kbro kbrt kbtb kbte kbtk kbto kbtr kbtt kebb kebe kebi kebr kebt keek keer keet keib keii keik keio keir kekb keke keki keko keok ker- kerb kere keri kerk kero kerr kert ket- kete keti ketk keto ketr kett kibb kibe kibi kibo kibr kibt kier kiii kiik kiit kiki kikk kiko kikr kikt kioe kioi kiok kioo kiot kirb kiri kirk kiro kirr kirt kite kiti kito kitr kitt kkbb kkbe kkbi kkbo kkbr kkbt kkik kkit kkkk kkob kkoo kkor kkot kkrb kkre kkrk kkro kkrr kkrt kktk kobb kobe kobi kobk kobo kobr koei koii koir koit kokb koke koki kokk koko kokr koob kooi kook kooo koor koot korb kore kori kork koro korr kort kotb kote koti kotk koto kotr kott krbb krbe krbi krbk krbr krbt kreb kree krei krek kreo kret krib krik krio krit krke krki krkk krko krkr krob kroe kroi krok kroo kror krrb krre krri krrk krro krrr krrt krti krtk krto krtr ktbb ktbr ktbt ktee ktek ktib ktie ktik ktkb ktke ktkk ktko ktkr ktkt ktob ktoe ktok ktoo ktor ktot ktrb ktre ktri ktrk ktro ktrr ktrt ktti kttk ktto kttr kttt o-eo obbo ober obet obie obit obkb oboe oboi obok obor obot obre obri obro oere oeti oier oiii oike oiko oire oirt oiti oker oket okie okir okko okok okor okot okre okro okto oobe oobi ooer oooo oore oort ootb orbb orbe orbi orbo ore- oreb orek oreo orer ori- orie orio orit orke orko oro- oroe orok oror orot orri orro orte orto otee oter otit oto- otoe otok otoo otor otre otro otte otti otto rbbb rbbr rebb rebe rebk rebo reeb reek reet reii reik reir reit reke reki reko rekt reot rere reri rero rert rete reti reto retr rett rib- ribe ribo riek rier riet rike riki rikk riot rire riri rite riti rito ritt rob- robb robe robi robo robt roer roet roik roio roir roit roke roki rokk roko rokr roob rooi rook roor root rore rori rork roro rort rote roti rotk roto rotr rott rrrr rtee rtei tbit tbrb tebo teek teer teet teie teir teke teok teor ter- tere teri terk tero terr tete teti teto tetr tett tibi tie- tiee tiei tieo tier tiet tiit tike tiki tiko tirb tire tiri tiro tirr tite titi tito titt tobe tobi tobo tobt toee toei toek toer toet toie toit toke toki toko took toor toot tore tori tork toro torr tort tote toti toto totr tott tre- tree trei trek treo tret tri- trib trie trik trio trit troe troi troo trot trte trtr ttbb tteo tter ttoe tttt