bbb bbe bbf bbg bbs be- beb bee bef beg bes bfb bfe bff bfg bfs bgb bge bgf bgg bgs bsb bse bsf bsg bss ebb ebe ebf ebg ebs eeb eee eef eeg ees ef- efb efe eff efg efs egb ege egf egg egs es- esb ese esf esg ess fbb fbe fbf fbg fbs feb fee fef feg fes ffe fff ffg ffs fgb fge fgf fgg fgs fsb fse fsf fsg fss gbe gbf gbg gbs ge- geb gee gef geg ges gfb gfe gff gfs ggb ggg ggs gsb gse gsf gsg gss sbb sbe sbf sbg sbs se- seb see sef seg ses sfb sfe sff sfg sfs sgb sge sgf sgg sgs ss- ssb sse ssf ssg sss