-ic bbb bbc bbi bbo bbr bbs bbt bcb bcc bci bco bcr bcs bct bi- bib bic bii bio bir bis bit bob boc boi boo bor bos bot brb bri bro brr brs brt bsb bsc bsi bso bsr bss bst btb btc bti bto btr bts btt c-- cbb cbc cbi cbo cbr cbs cbt ccb ccc cci cco ccr ccs cct ci- cib cic cii cio cir cis cit co- cob coc coi coo cor cos cot crb crc cri cro crr crs crt csb csc csi cso csr css cst ctb ctc cti cto ctr cts ctt ibb ibc ibi ibo ibr ibs ibt icb icc ici ico icr ics ict iib iic iii iio iir iis iit io- iob ioc ioi ioo ior ios iot ir- irb irc iri iro irr irs irt is- isb isc isi iso isr iss ist itb itc iti ito its itt o-i ob- obb obc obi obo obr obs obt oc- ocb occ oci oco ocr ocs oct oib oic oii oio oir ois oit oo- oob ooc ooi ooo oor oos oot or- orb orc ori oro orr ors ort os- osb osc osi oso osr oss ost ot- otb otc oti oto otr ots ott rbb rbc rbi rbo rbr rbs rbt rcb rcc rci rco rcr rcs rct rib ric rii rio rir ris rit rob roc roi roo ror ros rot rrb rrc rri rrr rrs rrt rsb rsc rsi rso rsr rss rst rtb rtc rti rto rtr rts rtt sbb sbc sbi sbo sbr sbs sbt scb scc sci sco scr scs sct sib sic sii sio sir sis sit sob soc soi soo sor sos sot sr- srb src sri sro srr srs srt ss- ssb ssc ssi sso ssr sss sst stb stc sti sto str sts stt tbb tbc tbi tbo tbr tbs tbt tcb tcc tci tco tcr tcs tct tib tic tii tio tir tis tit to- tob toc toi too tor tos tot trb trc tri tro trr trs trt tsb tsc tsi tso tsr tss tst ttb ttc tti tto ttr tts ttt

bbbb bbbs bbci bbrc bcbc bcbs bccc bcci bccs bcis bcit bcor bcos bcrs bcsc bcss bctc bcts bibb bibi bibo bibs bicc bici bico bics biis bio- bioc bioi bios biot birb biri biro birr birs birt bis- bisc biso biss bist bitc bito bits bitt bobb bobi bobo bobs boco bocs boi- boii bois boit boob booc boor boos boot bor- bori boro borr bors bort bosc bosi boso boss bost botb boti boto bots bott brcb bric brio bris brit brob broc broo bror bros brot brrr brrs brsb brsr brst brtc bsci bscs bsic bsos bssc bsts btcc btcs btob btor btrc btrt btss bttb c-bo cbbc cbbs cbcc cbcr cbcs cbct cbir cbit cbot cbrt cbsc cbsi cbtc ccbc cccb cccc ccci cccs ccic ccii ccir ccis ccob ccoc ccrc ccri ccrs ccrt ccsi ccss ccst cctb cctc cctt cibc cibi cibo cicc cici cico cicr cics cict ciii ciis ciit ciob cior cios cirb circ ciri ciro cirr cirs cirt cis- cisc cisr ciss cist citb citi cito cits citt cobb cobi cobo cobs coco coct 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 crbc crcc crcr crib cric cris crit crob croc croo cror crot crrt crss crst crtc crts cscb cscc csci csco cscr cscs csib csio csir csis csit csob csor csos csot csrc csrs cssr cstc csto cstr csts ctbi ctbs ctic ctor ctos ctot ctrc ctrs ctsc ctss ctts ibcs ibis ibos ibot ibrc ibri ibro ibss ibtb ibtc ibts icbc icbs iccb iccc icci icco iccr iccs icct icis icoc icor icos icrc icrr icrs icrt icsb icsc icsi icsr icss icst icts iiii iiio iiis iiit iioi iioo iios iirc iirs iisc iisi iisr iist iitr iitt iobi ioci ioii ioio ioit iooi iooo ioos iori iors ioso ioto ircc ircs iri- iric irio iris irob iroc irrc irri irrs irti irts isbt iscc isci isco iscr iscs isct isic isis isit iso- isoc isor isos isri issc issi isso issr isss istc isti isto istr ists itbs itcs itic itis itoi itoo itor itos itri itrs itsi itso itto obbo obis obit oboi obor obos obot obri obro obsr obss obst obts ocbc occc occi occt ocis ocos ocro ocrr ocrs oct- octi octo octs oici oiii oios oirt oisc oist oitc oiti oobi oocr oooo ooos oort oosi oost ootb oots orbb orbi orbo orbs orci orco orcs ori- oric orio oris orit oro- oror oros orot orri orro orrs orsi orso ortc orto orts oscc osci osco osii osis osoi osoo osor osos osro ossb ossi osso ostc osti ostr osts otbs otic otis otit oto- otoo otor otos otro otrs otso otti otto otts rbbb rbbr rbbs rbis rbss rbst rcbc rcbo rccb rccc rccs rcic rcis rcos rcsc rcsi rcss rctc rcti rcts rib- ribo ribs ricc rico rics rict riis rios riot riri rirs risc risi riso riss rist riti rito rits ritt rob- robb robi robo robs robt rocc roco rocs roio roir rois roit roob rooi roor roos root rorc rori roro rort rosc rosi roso ross rost rotc roti roto rotr rots rott rrrr rsbi rscc rscs rsis rsos rsts rtcc rtss rtts s-ib s-ic s-ii s-os sbbs sbcc sbcs sbct sbic sbor sbot sbsi sbst sbtc scbi sccc sccs scct sci- scic scio scir scis scit scob scoo scor scot scr- scrc scri scrs scsc scsi scso scsr scst sctc scto sctr scts sibc sibi sibo sibs sicc sici sico sics siit sior sios siot sirc siri siro sirr sirs sirt sisc sisi siss sist sit- sitc siti sito sits sitt sobo sobr sobs sobt soci soco socr socs soic soir sois soit soor soos soot sorb sori soro sorr sors sort