a-a a-b aaa aab aae aas aaw aax ab- aba abb abe abs abw abx aea aeb aee aes aew aex as- asa asb ase ass asw asx aw- awa awb awe aws aww ax- axa axe axs axx baa bab bae bas baw bax bba bbb bbe bbs bbw bbx be- bea beb bee bes bew bex bsa bsb bse bss bsw bsx bwa bwb bws bxb bxw bxx eaa eab eae eas eaw eax eba ebb ebe ebs ebw ebx eea eeb eee ees eew eex es- esa esb ese ess esw esx ewa ewb ewe ews eww ex- exa exe exs exw exx saa sab sae sas saw sax sba sbb sbe sbs sbw sbx se- sea seb see ses sew sex ss- ssa ssb sse sss ssw ssx swa swb swe sws sxs waa wab wae was waw wax wba wbb wbe wbs wbw wbx wea web wee wes wew wex wsa wsb wse wss wsw wsx wwa wwe www wxw xaa xas xbe xbx xee xes xew xex xsa xsb xss xwa xxx