-ic b-u bbb bbc bbi bbo bbr bbs bbt bbu bcb bcc bci bco bcr bcs bct bcu bi- bib bic bii bio bir bis bit biu bob boc boi boo bor bos bot bou brb bri bro brr brs brt bru bsb bsc bsi bso bsr bss bst bsu btb btc bti bto btr bts btt btu bub buc bui buo bur bus but buu c-- cbb cbc cbi cbo cbr cbs cbt cbu ccb ccc cci cco ccr ccs cct ccu ci- cib cic cii cio cir cis cit ciu co- cob coc coi coo cor cos cot cou crb crc cri cro crr crs crt cru csb csc csi cso csr css cst csu ctb ctc cti cto ctr cts ctt ctu cub cuc cui cuo cur cus cut cuu ibb ibc ibi ibo ibr ibs ibt ibu icb icc ici ico icr ics ict icu iib iic iii iio iir iis iit iiu io- iob ioc ioi ioo ior ios iot iou ir- irb irc iri iro irr irs irt iru is- isb isc isi iso isr iss ist isu itb itc iti ito its itt itu iu- iub iuc iui iur ius iut o-i ob- obb obc obi obo obr obs obt obu oc- ocb occ oci oco ocr ocs oct ocu oib oic oii oio oir ois oit oiu oo- oob ooc ooi ooo oor oos oot or- orb orc ori oro orr ors ort oru os- osb osc osi oso osr oss ost osu ot- otb otc oti oto otr ots ott otu ou- ouc oui ouo our ous out rbb rbc rbi rbo rbr rbs rbt rbu rcb rcc rci rco rcr rcs rct rcu rib ric rii rio rir ris rit rob roc roi roo ror ros rot rou rrb rrc rri rrr rrs rrt rru rsb rsc rsi rso rsr rss rst rsu rtb rtc rti rto rtr rts rtt rtu rub ruc rui ruo rur rus rut ruu sbb sbc sbi sbo sbr sbs sbt sbu scb scc sci sco scr scs sct scu sib sic sii sio sir sis sit siu sob soc soi soo sor sos sot sou sr- srb src sri sro srr srs srt ss- ssb ssc ssi sso ssr sss sst ssu stb stc sti sto str sts stt stu sub suc sui suo sur sus sut suu tbb tbc tbi tbo tbr tbs tbt tbu tcb tcc tci tco tcr tcs tct tcu tib tic tii tio tir tis tit tiu to- tob toc toi too tor tos tot tou trb trc tri tro trr trs trt tru tsb tsc tsi tso tsr tss tst tsu ttb ttc tti tto ttr tts ttt ttu tub tuc tui tuo tur tus tut tuu ubb ubc ubi ubo ubr ubs ubt ubu ucb ucc uci uco ucr ucs uct ucu uib uic uii uio uir uis uit uiu uob uoc uoo uor uos uot ur- urb urc uri uro urr urs urt uru usb usc usi uso usr uss ust usu utb utc uti uto utr uts utt utu uuc uur uus uut uuu

-ous bbbb bbbs bbci bbrc bcbc bcbs bccc bcci bccs bcis bcit bcor bcos bcrs bcru bcsc bcss bctc bcts bcuc bibb bibi bibo bibs bicc bici bico bics biis bio- bioc bioi bios biot biou birb biri biro birr birs birt biru bis- bisc biso biss bist bisu bitc bito bits bitt bitu bobb bobi bobo bobs bobu boco bocs bocu boi- boii bois boit boiu boob booc boor boos boot bor- bori boro borr bors bort boru bosc bosi boso boss bost bosu botb boti boto bots bott bour bous bout brcb bric brio bris brit brob broc broo bror bros brot brou brrr brrs brsb brsr brst brtc bruc brus brut bsci bscs bsic bsos bssc bsts btcc btcs btob btor btrc btrt btss bttb btus bubb bubi bubo bubs bubu bucc buci buco bucs bucu buic buir buis buit buiu bur- burb buri buro burr burs burt buru busc busi buss bust busu but- buti buto buts butt buus c-bo cbbc cbbs cbcc cbcr cbcs cbct cbcu cbir cbit cbot cbrt cbsc cbsi cbtc cbus ccbc cccb cccc ccci cccs cccu ccic ccii ccir ccis ccob ccoc ccrc ccri ccrs ccrt ccsi ccss ccst cctb cctc cctt ccuc ccus ccut cibc cibi cibo cicc cici cico cicr cics cict cicu ciii ciis ciit ciob cior cios cirb circ ciri ciro cirr cirs cirt cis- cisc cisr ciss cist citb citi cito cits citt citu ciuc cius cobb cobi cobo cobs cobu coco coct cocu coir cois coit coob coos coot cor- corb corc cori coro corr cors cort cosc cosi coso coss cost cotb cotc coti coto cots cott cotu coub cour cous cout crbc crbu crcc crcr crib cric cris crit criu crob croc croo cror crot crrt crss crst crtc crts crub crus crut cscb cscc csci csco cscr cscs csib csio csir csis csit csob csor csos csot csrc csrs cssr cstc csto cstr csts csur csus ctbi ctbs ctic ctor ctos ctot ctrc ctrs ctsc ctss ctsu ctts cub- cubb cubi cubs cucc cuci cui- cuir cuis cuit curb curi curo curr curs curt cusb cuso cuss cust cusu cut- cutc cuto cuts cutt ibcs ibis ibos ibot ibrc ibri ibro ibss ibtb ibtc ibts ibus icbc icbs iccb iccc icci icco iccr iccs icct iccu icis icoc icor icos icrc icrr icrs icrt icru icsb icsc icsi icsr icss icst icts icub icus iiii iiio iiis iiit iioi iioo iios iirc iirs iisc iisi iisr iist iisu iitr iitt iiuc iobi ioci ioii ioio ioit iooi iooo ioos iori iors ioso iosu ioto ious ircc ircs ircu iri- iric irio iris irob iroc irrc irri irrs irti irts irus isbt iscc isci isco iscr iscs isct iscu isic isis isit iso- isoc isor isos isri issc issi isso issr isss issu istc isti isto istr ists isus itbs itcs itic itis itoi