-ic b-u bbb bbc bbi bbo bbr bbs bbu bcb bcc bci bco bcr bcs bcu bi- bib bic bii bio bir bis biu bob boc boi boo bor bos bou brb bri bro brr brs bru bsb bsc bsi bso bsr bss bsu bub buc bui buo bur bus buu c-- cbb cbc cbi cbo cbr cbs cbu ccb ccc cci cco ccr ccs ccu ci- cib cic cii cio cir cis ciu co- cob coc coi coo cor cos cou crb crc cri cro crr crs cru csb csc csi cso csr css csu cub cuc cui cuo cur cus cuu ibb ibc ibi ibo ibr ibs ibu icb icc ici ico icr ics icu iib iic iii iio iir iis iiu io- iob ioc ioi ioo ior ios iou ir- irb irc iri iro irr irs iru is- isb isc isi iso isr iss isu iu- iub iuc iui iur ius o-i ob- obb obc obi obo obr obs obu oc- ocb occ oci oco ocr ocs ocu oib oic oii oio oir ois oiu oo- oob ooc ooi ooo oor oos or- orb orc ori oro orr ors oru os- osb osc osi oso osr oss osu ou- ouc oui ouo our ous rbb rbc rbi rbo rbr rbs rbu rcb rcc rci rco rcr rcs rcu rib ric rii rio rir ris rob roc roi roo ror ros rou rrb rrc rri rrr rrs rru rsb rsc rsi rso rsr rss rsu rub ruc rui ruo rur rus ruu sbb sbc sbi sbo sbr sbs sbu scb scc sci sco scr scs scu sib sic sii sio sir sis siu sob soc soi soo sor sos sou sr- srb src sri sro srr srs ss- ssb ssc ssi sso ssr sss ssu sub suc sui suo sur sus suu ubb ubc ubi ubo ubr ubs ubu ucb ucc uci uco ucr ucs ucu uib uic uii uio uir uis uiu uob uoc uoo uor uos ur- urb urc uri uro urr urs uru usb usc usi uso usr uss usu uuc uur uus uuu

-ous bbbb bbbs bbci bbrc bcbc bcbs bccc bcci bccs bcis bcor bcos bcrs bcru bcsc bcss bcuc bibb bibi bibo bibs bicc bici bico bics biis bio- bioc bioi bios biou birb biri biro birr birs biru bis- bisc biso biss bisu bobb bobi bobo bobs bobu boco bocs bocu boi- boii bois boiu boob booc boor boos bor- bori boro borr bors boru bosc bosi boso boss bosu bour bous brcb bric brio bris brob broc broo bror bros brou brrr brrs brsb brsr bruc brus bsci bscs bsic bsos bssc bubb bubi bubo bubs bubu bucc buci buco bucs bucu buic buir buis buiu bur- burb buri buro burr burs buru busc busi buss busu buus c-bo cbbc cbbs cbcc cbcr cbcs cbcu cbir cbsc cbsi cbus ccbc cccb cccc ccci cccs cccu ccic ccii ccir ccis ccob ccoc ccrc ccri ccrs ccsi ccss ccuc ccus cibc cibi cibo cicc cici cico cicr cics cicu ciii ciis ciob cior cios cirb circ ciri ciro cirr cirs cis- cisc cisr ciss ciuc cius cobb cobi cobo cobs cobu coco cocu coir cois coob coos cor- corb corc cori coro corr cors cosc cosi coso coss coub cour cous crbc crbu crcc crcr crib cric cris criu crob croc croo cror crss crub crus cscb cscc csci csco cscr cscs csib csio csir csis csob csor csos csrc csrs cssr csur csus cub- cubb cubi cubs cucc cuci cui- cuir cuis curb curi curo curr curs cusb cuso cuss cusu ibcs ibis ibos ibrc ibri ibro ibss ibus icbc icbs iccb iccc icci icco iccr iccs iccu icis icoc icor icos icrc icrr icrs icru icsb icsc icsi icsr icss icub icus iiii iiio iiis iioi iioo iios iirc iirs iisc iisi iisr iisu iiuc iobi ioci ioii ioio iooi iooo ioos iori iors ioso iosu ious ircc ircs ircu iri- iric irio iris irob iroc irrc irri irrs irus iscc isci isco iscr iscs iscu isic isis iso- isoc isor isos isri issc issi isso issr isss issu isus iucc iuiu iuss obbo obis oboi obor obos obri obro obsr obss obus ocbc occc occi ocis ocos ocro ocrr ocrs ocur oici oiii oios oisc oisu oobi oocr oooo ooos oosi oous orbb orbi orbo orbs orbu orci orco orcs ori- oric orio oris oro- oror oros orri orro orrs orsi orso orsu orub orus oscc osci osco osii osis osoi osoo osor osos osro ossb ossi osso ossu oubs oucc ouii ouir ouis our- ouro ours ouu- rbbb rbbr rbbs rbis rbss rcbc rcbo rccb rccc rccs rcic rcis rcos rcsc rcsi rcss rib- ribo ribs ribu ricc rico rics riis rios riou riri rirs risc risi riso riss risu rius rob- robb robi robo robs robu rocc roco rocs roio roir rois roiu roob rooi roor roos rorc rori roro roru rosc rosi roso ross roub rous rrrr rsbi rscc rscs rsis rsos rubb rubi rubs rubu ruci ruis rurc ruri ruro rurs ruru rusi ruso russ rusu s-ib s-ic s-ii s-os sbbs sbcc sbcs sbic sbor sbsi sbus scbi sccc sccs sci- scic scio scir scis scob scoo scor scr- scrc scri scrs scsc scsi scso scsr scsu scub scur sibc sibi sibo sibs sibu sicc sici sico sics sicu sior sios siou sirc siri siro sirr sirs siru sisc sisi siss sisu siui sius sobo sobr sobs sobu soci soco socr socs soic soir sois soor soos sorb sori soro sorr sors soru sosi soso soss sour sous srbc srcc srib sris sros srub ssbr sscc ssci sscs ssis ssoc ssrc ssri ssrs sssb sssc sssi ssss sub- subb subi subo subs suc- succ suci sucr sucs suio suir suis suor suos sur- surc suri suro surr surs suru sus- susi suso suss susu suus ubbi ubbo ubic ubii ubir ubis uboc ubos ucbc ucci ucio ucos ucrc ucsb ucsc ucsu uirr uocc uor- urbi