bbb bbc bbe bbg bbk bbo bbs bcb bcc bce bcg bck bco bcs be- beb bec bee beg bek beo bes bgb bgc bge bgg bgk bgo bgs bkb bkc bke bkg bkk bko bks bob boc boe bog bok boo bos bsb bsc bse bsg bsk bso bss c-- cbb cbc cbe cbg cbk cbo cbs ccb ccc cce ccg cck cco ccs ce- ceb cec cee ceg cek ceo ces cgb cgc cge cgg cgo cgs ckb ckc cko cks co- cob coc coe cog cok coo cos csb csc cse csg csk cso css ebb ebc ebe ebg ebk ebo ebs ec- ecb ecc ece ecg eck eco ecs eeb eec eee eeg eek eeo ees egb egc ege egg ego egs ekb ekc eke ekg eko eks eo- eob eoc eoe eog eok eoo eos es- esb esc ese esg esk eso ess gbc gbe gbg gbk gbo gbs gcb gcc gce gcg gck gco gcs ge- geb gec gee geg gek geo ges ggb ggc ggg ggo ggs gkb gko gks gob goc goe gog gok goo gos gsb gsc gse gsg gsk gso gss kbb kbc kbe kbk kbo kbs kcb kcc kce kcg kck kcs ke- keb kec kee keg kek keo kes kgb kgc kgo kgs kkb kkc kke kkk kks kob koc koe kog kok koo kos ksb ksc kse ksg ksk kso kss ob- obb obc obe obg obk obo obs oc- ocb occ ocg ock oco ocs oeb oec oee oeg oeo oes ogc oge ogg ogo ogs okb okc oke okg okk oko oks oo- oob ooc oog ook ooo oos os- osb osc ose osg osk oso oss sbb sbc sbe sbg sbk sbo sbs scb scc sce scg sck sco scs se- seb sec see seg sek seo ses sgb sgc sge sgg sgk sgo sgs sk- skb skc ske skg skk sko sks sob soc soe sog sok soo sos ss- ssb ssc sse ssg ssk sso sss