-ic bbb bbc bbg bbi bbk bbo bbs bbt bcb bcc bcg bci bck bco bcs bct bgb bgc bgg bgi bgk bgo bgs bgt bi- bib bic big bii bik bio bis bit bkb bkc bkg bkk bko bks bkt bob boc bog boi bok boo bos bot bsb bsc bsg bsi bsk bso bss bst btb btc btg bti btk bto bts btt c-- cbb cbc cbg cbi cbk cbo cbs cbt ccb ccc ccg cci cck cco ccs cct cgb cgc cgg cgi cgo cgs cgt ci- cib cic cig cii cik cio cis cit ckb ckc cki cko cks ckt co- cob coc cog coi cok coo cos cot csb csc csg csi csk cso css cst ctb ctc ctg cti ctk cto cts ctt gbc gbg gbi gbk gbo gbs gbt gcb gcc gcg gci gck gco gcs gct ggb ggc ggg ggi ggo ggs ggt gib gic gig gii gik gio gis git gkb gko gks gkt gob goc gog goi gok goo gos got gsb gsc gsg gsi gsk gso gss gst gtb gtc gtg gti gtk gto gts gtt ibb ibc ibg ibi ibk ibo ibs ibt icb icc icg ici ick ico ics ict igb igc igg igi igk igo igs igt iib iic iii iio iis iit ikb ikc iki ikk iko iks ikt io- iob ioc iog ioi ioo ios iot is- isb isc isg isi isk iso iss ist itb itc itg iti itk ito its itt k-t kbb kbc kbi kbk kbo kbs kcb kcc kcg kci kck kcs kct kgb kgc kgi kgo kgs kib kic kig kii kik kio kis kit kkb kkc kki kkk kks kkt kob koc kog koi kok koo kos kot ksb ksc ksg ksi ksk kso kss kst ktb ktc ktg ktk kto kts ktt o-i ob- obb obc obg obi obk obo obs obt oc- ocb occ ocg oci ock oco ocs oct ogc ogg ogi ogo ogs ogt oib oic oii oik oio ois oit okb okc okg oki okk oko oks oo- oob ooc oog ooi ook ooo oos oot os- osb osc osg osi osk oso oss ost ot- otb otc otg oti otk oto ots ott sbb sbc sbg sbi sbk sbo sbs sbt scb scc scg sci sck sco scs sct sgb sgc sgg sgi sgk sgo sgs sgt sib sic sig sii sik sio sis sit sk- skb skc skg ski skk sko sks skt sob soc sog soi sok soo sos sot ss- ssb ssc ssg ssi ssk sso sss sst stb stc stg sti stk sto sts stt tbb tbc tbg tbi tbk tbo tbs tbt tcb tcc tcg tci tck tco tcs tct tgb tgc tgg tgi tgk tgo tgs tgt tib tic tig tii tik tio tis tit tkb tkc tkg tkk tko tks tkt to- tob toc tog toi tok too tos tot tsb tsc tsg tsi tsk tso tss tst ttb ttc ttg tti ttk tto tts ttt