bbb bbe bbi bbo bbs be- beb bee bei beo bes bi- bib bie bii bio bis bob boe boi boo bos bsb bse bsi bso bss ebb ebe ebi ebo ebs eeb eee eeo ees eib eie eii eio eis eo- eob eoe eoi eoo eos es- esb ese esi eso ess ibb ibe ibi ibo ibs ie- iee iei ies iib iie iii iio iis io- iob ioe ioi ioo ios is- isb ise isi iso iss o-i ob- obb obe obi obo obs oeb oee oei oeo oes oib oie oii oio ois oo- oob ooi ooo oos os- osb ose osi oso oss sbb sbe sbi sbo sbs se- seb see sei seo ses sib sie sii sio sis sob soe soi soo sos ss- ssb sse ssi sso sss