b-u bbb bbe bbi bbo bbs bbu bbx be- beb bee bei beo bes beu bex bi- bib bie bii bio bis biu bix bob boe boi boo bos bou box bsb bse bsi bso bss bsu bsx bub bue bui buo bus buu bux bxb bxi bxo bxx ebb ebe ebi ebo ebs ebu ebx eeb eee eeo ees eex eib eie eii eio eis eiu eix eo- eob eoe eoi eoo eos eou es- esb ese esi eso ess esu esx eu- eub eue eui eus eux ex- exe exi exo exs exu exx ibb ibe ibi ibo ibs ibu ibx ie- iee iei ies iex iib iie iii iio iis iiu iix io- iob ioe ioi ioo ios iou is- isb ise isi iso iss isu iu- iub iue iui ius ixe ixi o-i ob- obb obe obi obo obs obu obx oeb oee oei oeo oes oex oib oie oii oio ois oiu oo- oob ooi ooo oos oox os- osb ose osi oso oss osu osx ou- oue oui ouo ous ox- oxb oxi oxo oxx sbb sbe sbi sbo sbs sbu sbx se- seb see sei seo ses seu sex sib sie sii sio sis siu six sob soe soi soo sos sou sox ss- ssb sse ssi sso sss ssu ssx sub sue sui suo sus suu sux sxi sxs sxu ubb ube ubi ubo ubs ubu ubx ueb uee uei ues uib uie uii uio uis uiu uob uoe uoo uos uox usb use usi uso uss usu usx uue uus uuu uxb uxo uxu xbe xbx xee xes xeu xex xie xii xio xis xiu xix xoi xoo xos xox xsb xsi xss xue xui xus xxi xxo xxx