a-a a-b a-i a-t aaa aab aai aas aat aau aax ab- aba abb abi abs abt abu abx ai- aia aib aii ais ait aiu aix as- asa asb asi ass ast asu asx at- ata atb ati ats att atu atx au- aua aub aui aus aut aux ax- axa axi axs axt axx b-u baa bab bai bas bat bau bax bba bbb bbi bbs bbt bbu bbx bi- bia bib bii bis bit biu bix bsa bsb bsi bss bst bsu bsx bta btb bti bts btt btu btx bua bub bui bus but buu bux bxb bxi bxx ia- iaa iab iai ias iat iau iba ibb ibi ibs ibt ibu ibx iia iib iii iis iit iiu iix is- isa isb isi iss ist isu ita itb iti its itt itu itx iu- iua iub iui ius iut ixi saa sab sai sas sat sau sax sba sbb sbi sbs sbt sbu sbx sia sib sii sis sit siu six ss- ssa ssb ssi sss sst ssu ssx sta stb sti sts stt stu stx sua sub sui sus sut suu sux sxi sxs sxt sxu t-x taa tab tai tas tat tau tax tba tbb tbi tbs tbt tbu tia tib tii tis tit tiu tix tsa tsb tsi tss tst tsu tsx tta ttb tti tts ttt ttu ttx tua tub tui tus tut tuu tux txi txs txt txu ua- uaa uab uai uas uat uau uba ubb ubi ubs ubt ubu ubx uia uib uii uis uit uiu usa usb usi uss ust usu usx uta utb uti uts utt utu utx uua uus uut uuu uxb uxt uxu xaa xas xat xau xbx xia xii xis xit xiu xix xsa xsb xsi xss xst xti xts xtx xui xus xxi xxx