bbb bbe bbi bbo bbs bbx be- beb bee bei beo bes bex bi- bib bie bii bio bis bix bob boe boi boo bos box bsb bse bsi bso bss bsx bxb bxi bxo bxx ebb ebe ebi ebo ebs ebx eeb eee eeo ees eex eib eie eii eio eis eix eo- eob eoe eoi eoo eos es- esb ese esi eso ess esx ex- exe exi exo exs exx ibb ibe ibi ibo ibs ibx ie- iee iei ies iex iib iie iii iio iis iix io- iob ioe ioi ioo ios is- isb ise isi iso iss ixe ixi o-i ob- obb obe obi obo obs obx oeb oee oei oeo oes oex oib oie oii oio ois oo- oob ooi ooo oos oox os- osb ose osi oso oss osx ox- oxb oxi oxo oxx sbb sbe sbi sbo sbs sbx se- seb see sei seo ses sex sib sie sii sio sis six sob soe soi soo sos sox ss- ssb sse ssi sso sss ssx sxi sxs xbe xbx xee xes xex xie xii xio xis xix xoi xoo xos xox xsb xsi xss xxi xxo xxx