b-u bbb bbe bbf bbi bbs bbu bbx be- beb bee bef bei bes beu bex bfb bfe bff bfi bfs bfu bfx bi- bib bie bif bii bis biu bix bsb bse bsf bsi bss bsu bsx bub bue buf bui bus buu bux bxb bxi bxx ebb ebe ebf ebi ebs ebu ebx eeb eee eef ees eex ef- efb efe eff efi efs efx eib eie eif eii eis eiu eix es- esb ese esf esi ess esu esx eu- eub eue euf eui eus eux ex- exe exi exs exu exx fbb fbe fbf fbi fbs fbu fbx feb fee fef fei fes feu fex ffe fff ffi ffs ffu ffx fib fie fif fii fis fiu fix fsb fse fsf fsi fss fsu fsx fub fue fuf fui fus fuu fux fxe fxi fxs fxu fxx i-f ibb ibe ibf ibi ibs ibu ibx ie- iee ief iei ies iex ifb ife iff ifi ifs ifu ifx iib iie iif iii iis iiu iix is- isb ise isf isi iss isu iu- iub iue iui ius ixe ixi sbb sbe sbf sbi sbs sbu sbx se- seb see sef sei ses seu sex sfb sfe sff sfi sfs sfu sfx sib sie sif sii sis siu six ss- ssb sse ssf ssi sss ssu ssx sub sue suf sui sus suu sux sxi sxs sxu ubb ube ubf ubi ubs ubu ubx ueb uee uef uei ues ufe uff ufi ufs ufu ufx uib uie uif uii uis uiu usb use usf usi uss usu usx uue uus uuu uxb uxf uxu xbe xbx xee xes xeu xex xfe xfs xfx xie xii xis xiu xix xsb xsi xss xue xui xus xxi xxx