bbb bbg bbi bbo bbs bgb bgg bgi bgo bgs bi- bib big bii bio bis bob bog boi boo bos bsb bsg bsi bso bss gbg gbi gbo gbs ggb ggg ggi ggo ggs gib gig gii gio gis gob gog goi goo gos gsb gsg gsi gso gss ibb ibg ibi ibo ibs igb igg igi igo igs iib iii iio iis io- iob iog ioi ioo ios is- isb isg isi iso iss o-i ob- obb obg obi obo obs ogg ogi ogo ogs oib oii oio ois oo- oob oog ooi ooo oos os- osb osg osi oso oss sbb sbg sbi sbo sbs sgb sgg sgi sgo sgs sib sig sii sio sis sob sog soi soo sos ss- ssb ssg ssi sso sss