bbb bbg bbi bbo bbr bbs bgb bgg bgi bgo bgr bgs bi- bib big bii bio bir bis bob bog boi boo bor bos brb brg bri bro brr brs bsb bsg bsi bso bsr bss gbg gbi gbo gbr gbs ggb ggg ggi ggo ggr ggs gib gig gii gio gir gis gob gog goi goo gor gos grb grg gri gro grr grs gsb gsg gsi gso gsr gss ibb ibg ibi ibo ibr ibs igb igg igi igo igr igs iib iii iio iir iis io- iob iog ioi ioo ior ios ir- irb irg iri iro irr irs is- isb isg isi iso isr iss o-i ob- obb obg obi obo obr obs ogg ogi ogo ogs oib oii oio oir ois oo- oob oog ooi ooo oor oos or- orb org ori oro orr ors os- osb osg osi oso osr oss rbb rbg rbi rbo rbr rbs rgb rgg rgi rgo rgr rgs rib rig rii rio rir ris rob rog roi roo ror ros rrb rrg rri rrr rrs rsb rsg rsi rso rsr rss sbb sbg sbi sbo sbr sbs sgb sgg sgi sgo sgr sgs sib sig sii sio sir sis sob sog soi soo sor sos sr- srb srg sri sro srr srs ss- ssb ssg ssi sso ssr sss