bbbb bbbs bbeb bbrc bcbc bcbs bccc bccs bcec bcer bces bcrs bcru bcsc bcss bcuc bebb bebe beck becs becu beeb beek beer bees beke beks berc bere berk berr bers beru bes- bese besk bess beuk beur beze bezu brcb brce breb brec bree brek brer bres brez brkb brrr brrs brsb brsr bruc brue brus bruz bscs bseb bsec bsee bser bses bssc bsse bubb bube bubs bubu bucc buce buck bucs bucu bucz buer bueu buke bukk buku bur- burb bure burk burr burs buru burz busc buse busk buss busu buus buuz buze buzz bzer bzrk bzzz cbbc cbbs cbcc cbce cbcr cbcs cbcu cbec cbee cber cbkr cbre cbsc cbse cbus ccbc cccb cccc cccs cccu ccee ccrc ccre ccrs ccss ccuc ccus cebs cebu cec- cece cecs ceeb ceec cees ceke cer- cerc cere cers cesc cese cesr cess ceze ckbc ckbe ckck ckcs cker ckrc cksb crbc crbu crcc crce crcr crcz cre- creb crec cree cres creu crkc crss crub crue cruk crus cruz cscb cscc csce cscr cscs csec csee cser csks csrc csrs csse cssr csur csus cub- cubb cube cubs cucc cuce cuck cuek cuer cues cuk- cuke curb cure curr curs cusb cusk cuss cusu ebbc ebbr ebbs ebcc eber ebes ebru ebur ebus ecbc ecbe eccb eccc ecce eces ecks ecrc ecrr ecru ecsc ecse ecss ecsu ecus eecs eeee eees eeke eeks eerc eers eese eesk eeze ekeb ekek eker ekes ekur erbb erbe ercc erce ereb erec erer eres erez erke erks errc erre errs erse erub eruc erur erus esbs escb esce escr escs escu esee esek eser eses eske esks esku esse essu esus eubc euer eur- eurc eure euse ezek ezer ezuz kbbb kbbc kbbe kbbk kbbr kbbs kbbu kbbz kbcb kbce kbck kbcr kbcs kbcu kbcz kbeb kbec kbee kbek kber kbes kbez kbkb kbkk kbkr kbkz kbrb kbrc kbre kbrk kbru kbrz kbsb kbsk kbsr kbss kbsu kbsz kbub kbuc kbue kbuk kbur kbus kbuu kbuz kbzc kbze kbzs kbzu kbzz kcbc kcbk kcbr kcbs kcbu kccb kccc kcck kccr kccu kceb kcec kcee kceu kcez kckc kckk kckr kckz kcrc kcrr kcrs kcru kcrz kcsb kcsc kcse kcsr kcss kcsu kcub kcue kcuk kcuz kcze kczz kebb kebc kebe kebr kebu keck kecr keek keer kees kekb kekc keke keks keku ker- kerb kerc kere kerk kerr kers keru kerz kesb kesc kesk kesr kess kesz keur keus kezb keze kezr kezz kkbb kkbe kkbr kkbs kkbz kkcb kkck kkcr kkcs kkez kkkk kkrb kkrc kkre kkrk kkrr kkrs kkrz kkse kksr kkss kksu kkus kkuu kkzu kkzz krbb krbe krbk krbr krbz krcb krcc krce krcs krcu kreb krec kree krek kres kreu krez krkc krke krkk krkr krks krku krkz krrb krrc krre krrk krrr krrs krrz krsc krse krsk krsr krss krsu kruc krue kruk krur kruz krze krzk krzr krzs krzz ksbc ksbr ksbs ksbz kscb ksce ksck kscr kscs kscu ksec ksee ksek kser ksez kskb kske kskk kskr ksks ksku kskz ksrb ksrr ksrs ksrz ksse kssr ksss kssu kssz ksub ksue ksuu kszr kubb kubc kube kubr kubs kubu kucb kucc kuce kucr kuek kues kueu kuke kukk kuks kuku kurb kure kurk kurr kurs kuru kurz kusb kusc kusu kuub kuuk kuur kuuu kuuz kuze kuzu kuzz kzbb kzbe kzbk kzbr kzbs kzbz kzcr kzee kzer kzke kzkr kzks kzkz kzrb kzrc kzrk kzrr kzrs kzrz kzsb kzsc kzse kzsu kzue kzus kzuu kzuz kzzb kzzk kzzr kzzs kzzz rbbb rbbr rbbs rbss rcbc rccb rccc rccs rcsc rcss rebb rebe rebk rebs rebu recc rece reck recr recs recu recz reeb reek rees reke reks rere rers reru rese ress reue reuk reus reuu reze rezu rkss rrrr rscc rscs rsee rsre rubb rube rubs rubu ruce ruck ruer rues ruez ruke rukk ruku rurc rure rurs ruru ruse rusk russ rusu ruze sbbs sbcc sbcs sber sbrk sbse sbus sccc scce sccs scec scee scer sck- scr- scrc scre scrs scsc scsr scsu scub scur se-c se-e se-k se-s se-u se-z sebe sebs sec- secc sece seck secr secs secu seeb seec seek seer sees seeu seez seke sekk seku serb serc sere serk serr sers seru sesc sese sess seur skee sker skes skss skue skur srbc srcc sreb srec sres srub srzu ssbr sscc ssce sscs ssec ssee sses ssrc ssrs sssb sssc ssss sub- subb subs subz suc- succ suck sucr sucs suee suer sues sueu suez suke suks suku sur- surc sure surr surs suru sus- suse susk suss susu susz suus suze suzu suzz szss szuc szur ubbe ubek uber ucbc uces ucrc ucsb ucsc ucsu uers uess ukcc ukek ukes ukeu ukrc uksc ukur urbe urbs ure- ures urke urre urse urss ursu uruk urur urus uruz us-k usbc usbe usbr usbs uscc usce uscs usee user uses uske ussb ussc usse ussr usss ussu usus uuuu uzeb uzer zbek zber zbus zebe zebu zeck zeek zees zeke zekr zeks zeku zerk zeus zeze zrce zrze zsss zubr zubu zuce zuck zuke zukr zurb zurr zuru zuuk zuzu zzzs zzzz