bbb bbc bbg bbr bbs bcb bcc bcg bcr bcs bgb bgc bgg bgr bgs brb brg brr brs bsb bsc bsg bsr bss c-- cbb cbc cbg cbr cbs ccb ccc ccg ccr ccs cgb cgc cgg cgr cgs crb crc crg crr crs csb csc csg csr css gbc gbg gbr gbs gcb gcc gcg gcr gcs ggb ggc ggg ggr ggs grb grc grg grr grs gsb gsc gsg gsr gss rbb rbc rbg rbr rbs rcb rcc rcg rcr rcs rgb rgc rgg rgr rgs rrb rrc rrg rrr rrs rsb rsc rsg rsr rss sbb sbc sbg sbr sbs scb scc scg scr scs sgb sgc sgg sgr sgs sr- srb src srg srr srs ss- ssb ssc ssg ssr sss