bbbb bbbs bbrc bcbc bcbs bccc bccs bcnu bcrs bcru bcsc bcsn bcss bcuc bnrr bnss brcb brns brrr brrs brsb brsr bruc brun brus bscs bsns bssc bubb bubs bubu bucc bucs bucu bunb bunn buns bunu bur- burb burn burr burs buru busc buss busu buus cbbc cbbs cbcc cbcn cbcr cbcs cbcu cbrn cbsc cbsn cbus ccbc ccbn cccb cccc cccs cccu ccnb ccnc ccnr ccns ccnu ccrc ccrs ccsn ccss ccuc ccus cnbc cnrc cnrr cnss crbc crbu crcc crcr crns crss crub crun crus cscb cscc cscr cscs csrc csrs cssr csur csus cub- cubb cubs cucc cucn curb curn curr curs cusb cuss cusu nbbc nbcc nbcs ncbc ncbs nccc nccn nccr nccs nccu ncnc ncrc ncsc ncss nnnn nnss nrcs nrrc nrsc nscc nscs nsnr nsrc nssb nssc nssr nsss nsub nubc nubs nucs nucu nunc nunn nuns nurc nurn nurr nurs nuru nuss nusu rbbb rbbr rbbs rbss rcbc rccb rccc rccs rcnr rcsc rcss rnbr rncs rrrr rrun rscc rscn rscs rsnn rsnr rubb rubs rubu runc runn runs rurc rurs ruru russ rusu ruun sbbs sbcc sbcs sbus sccc sccs scnr scr- scrc scrn scrs scsc scsn scsr scsu scub scun scur sncc snns snrs snub snur snus srbc srcc srnn srub ssbn ssbr sscc sscs ssns ssrc ssrs sssb sssc ssss sub- subb subs suc- succ sucr sucs sun- sunb sunn suns sunu sur- surc surn surr surs suru sus- suss susu suus ucbc ucrc ucsb ucsc ucsu uncc uncs unns unrs uns- unsc unus urbs urns urss ursu urun urur urus usbc usbr usbs uscc uscs usnc usnr usnu ussb ussc ussr usss ussu usun usus uuuu