bbb bbe bbi bbo bbt be- beb bee bei beo bet bi- bib bie bii bio bit bob boe boi boo bot btb bte bti bto btt ebb ebe ebi ebo ebt eeb eee eeo eet eib eie eii eio eit eo- eob eoe eoi eoo eot etb ete eti eto ett ibb ibe ibi ibo ibt ie- iee iei iet iib iie iii iio iit io- iob ioe ioi ioo iot itb ite iti ito itt o-i ob- obb obe obi obo obt oeb oee oei oeo oet oib oie oii oio oit oo- oob ooi ooo oot ot- otb ote oti oto ott tbb tbe tbi tbo tbt te- teb tee tei teo tet tib tie tii tio tit to- tob toe toi too tot ttb tte tti tto ttt