bbb bbe bbf bbg bbo bbs be- beb bee bef beg beo bes bfb bfe bff bfg bfo bfs bgb bge bgf bgg bgo bgs bob boe bof bog boo bos bsb bse bsf bsg bso bss ebb ebe ebf ebg ebo ebs eeb eee eef eeg eeo ees ef- efb efe eff efg efo efs egb ege egf egg ego egs eo- eob eoe eof eog eoo eos es- esb ese esf esg eso ess fbb fbe fbf fbg fbo fbs feb fee fef feg feo fes ffe fff ffg ffo ffs fgb fge fgf fgg fgs fob foe fof fog foo fos fsb fse fsf fsg fso fss gbe gbf gbg gbo gbs ge- geb gee gef geg geo ges gfb gfe gff gfo gfs ggb ggg ggo ggs gob goe gof gog goo gos gsb gse gsf gsg gso gss ob- obb obe obf obg obo obs oeb oee oef oeg oeo oes of- ofb ofe off ofg ofo ofs oge ogf ogg ogo ogs oo- oob oof oog ooo oos os- osb ose osf osg oso oss sbb sbe sbf sbg sbo sbs se- seb see sef seg seo ses sfb sfe sff sfg sfo sfs sgb sge sgf sgg sgo sgs sob soe sof sog soo sos ss- ssb sse ssf ssg sso sss