bbbb bbbs bbeb bbrc bcbc bcbs bccc bccs bcec bcer bces bcrs bcsc bcss bebb bebe beck becs beeb beek beer bees beke beks berc bere berk berr bers bes- bese besk bess brcb brce breb brec bree brek brer bres brkb brrr brrs brsb brsr bscs bseb bsec bsee bser bses bssc bsse cbbc cbbs cbcc cbce cbcr cbcs cbec cbee cber cbkr cbre cbsc cbse ccbc cccb cccc cccs ccee ccrc ccre ccrs ccss cebs cec- cece cecs ceeb ceec cees ceke cer- cerc cere cers cesc cese cesr cess ckbc ckbe ckck ckcs cker ckrc cksb crbc crcc crce crcr cre- creb crec cree cres crkc crss cscb cscc csce cscr cscs csec csee cser csks csrc csrs csse cssr ebbc ebbr ebbs ebcc eber ebes ecbc ecbe eccb eccc ecce eces ecks ecrc ecrr ecsc ecse ecss eecs eeee eees eeke eeks eerc eers eese eesk ekeb ekek eker ekes erbb erbe ercc erce ereb erec erer eres erke erks errc erre errs erse esbs escb esce escr escs esee esek eser eses eske esks esse kbbb kbbc kbbe kbbk kbbr kbbs kbcb kbce kbck kbcr kbcs kbeb kbec kbee kbek kber kbes kbkb kbkk kbkr kbrb kbrc kbre kbrk kbsb kbsk kbsr kbss kcbc kcbk kcbr kcbs kccb kccc kcck kccr kceb kcec kcee kckc kckk kckr kcrc kcrr kcrs kcsb kcsc kcse kcsr kcss kebb kebc kebe kebr keck kecr keek keer kees kekb kekc keke keks ker- kerb kerc kere kerk kerr kers kesb kesc kesk kesr kess kkbb kkbe kkbr kkbs kkcb kkck kkcr kkcs kkkk kkrb kkrc kkre kkrk kkrr kkrs kkse kksr kkss krbb krbe krbk krbr krcb krcc krce krcs kreb krec kree krek kres krkc krke krkk krkr krks krrb krrc krre krrk krrr krrs krsc krse krsk krsr krss ksbc ksbr ksbs kscb ksce ksck kscr kscs ksec ksee ksek kser kskb kske kskk kskr ksks ksrb ksrr ksrs ksse kssr ksss rbbb rbbr rbbs rbss rcbc rccb rccc rccs rcsc rcss rebb rebe rebk rebs recc rece reck recr recs reeb reek rees reke reks rere rers rese ress rkss rrrr rscc rscs rsee rsre sbbs sbcc sbcs sber sbrk sbse sccc scce sccs scec scee scer sck- scr- scrc scre scrs scsc scsr se-c se-e se-k se-s sebe sebs sec- secc sece seck secr secs seeb seec seek seer sees seke sekk serb serc sere serk serr sers sesc sese sess skee sker skes skss srbc srcc sreb srec sres ssbr sscc ssce sscs ssec ssee sses ssrc ssrs sssb sssc ssss