b-u bbb bbe bbi bbo bbs bbt bbu bbx be- beb bee bei beo bes bet beu bex bi- bib bie bii bio bis bit biu bix bob boe boi boo bos bot bou box bsb bse bsi bso bss bst bsu bsx btb bte bti bto bts btt btu btx bub bue bui buo bus but buu bux bxb bxi bxo bxx ebb ebe ebi ebo ebs ebt ebu ebx eeb eee eeo ees eet eex eib eie eii eio eis eit eiu eix eo- eob eoe eoi eoo eos eot eou es- esb ese esi eso ess est esu esx etb ete eti eto ets ett etu etx eu- eub eue eui eus eut eux ex- exe exi exo exs ext exu exx ibb ibe ibi ibo ibs ibt ibu ibx ie- iee iei ies iet iex iib iie iii iio iis iit iiu iix io- iob ioe ioi ioo ios iot iou is- isb ise isi iso iss ist isu itb ite iti ito its itt itu itx iu- iub iue iui ius iut ixe ixi o-i ob- obb obe obi obo obs obt obu obx oeb oee oei oeo oes oet oex oib oie oii oio ois oit oiu oo- oob ooi ooo oos oot oox os- osb ose osi oso oss ost osu osx ot- otb ote oti oto ots ott otu ou- oue oui ouo ous out ox- oxb oxi oxo oxt oxx sbb sbe sbi sbo sbs sbt sbu sbx se- seb see sei seo ses set seu sex sib sie sii sio sis sit siu six sob soe soi soo sos sot sou sox ss- ssb sse ssi sso sss sst ssu ssx stb ste sti sto sts stt stu stx sub sue sui suo sus sut suu sux sxi sxs sxt sxu t-x tbb tbe tbi tbo tbs tbt tbu te- teb tee tei teo tes tet teu tex tib tie tii tio tis tit tiu tix to- tob toe toi too tos tot tou tox tsb tse tsi tso tss tst tsu tsx ttb tte tti tto tts ttt ttu ttx tub tue tui tuo tus tut tuu tux txe txi txs txt txu ubb ube ubi ubo ubs ubt ubu ubx ueb uee uei ues uet uib uie uii uio uis uit uiu uob uoe uoo uos uot uox usb use usi uso uss ust usu usx utb ute uti uto uts utt utu utx uue uus uut uuu uxb uxo uxt uxu xbe xbx xee xes xet xeu xex xie xii xio xis xit xiu xix xoi xoo xos xot xox xsb xsi xss xst xti xts xtx xue xui xus xxi xxo xxx