a-a a-b a-i a-t aaa aab aai aao aas aat aau aax ab- aba abb abi abo abs abt abu abx ai- aia aib aii aio ais ait aiu aix aoa aob aoi aoo aos aot aou aox as- asa asb asi aso ass ast asu asx at- ata atb ati ato ats att atu atx au- aua aub aui auo aus aut aux ax- axa axi axo axs axt axx b-u baa bab bai bao bas bat bau bax bba bbb bbi bbo bbs bbt bbu bbx bi- bia bib bii bio bis bit biu bix boa bob boi boo bos bot bou box bsa bsb bsi bso bss bst bsu bsx bta btb bti bto bts btt btu btx bua bub bui buo bus but buu bux bxb bxi bxo bxx ia- iaa iab iai iao ias iat iau iba ibb ibi ibo ibs ibt ibu ibx iia iib iii iio iis iit iiu iix io- ioa iob ioi ioo ios iot iou is- isa isb isi iso iss ist isu ita itb iti ito its itt itu itx iu- iua iub iui ius iut ixi o-i oaa oab oai oao oas oat oau oax ob- oba obb obi obo obs obt obu obx oia oib oii oio ois oit oiu oo- ooa oob ooi ooo oos oot oox os- osa osb osi oso oss ost osu osx ot- ota otb oti oto ots ott otu ou- oua oui ouo ous out ox- oxa oxb oxi oxo oxt oxx saa sab sai sao sas sat sau sax sba sbb sbi sbo sbs sbt sbu sbx sia sib sii sio sis sit siu six soa sob soi soo sos sot sou sox ss- ssa ssb ssi sso sss sst ssu ssx sta stb sti sto sts stt stu stx sua sub sui suo sus sut suu sux sxi sxs sxt sxu t-x taa tab tai tao tas tat tau tax tba tbb tbi tbo tbs tbt tbu tia tib tii tio tis tit tiu tix to- toa tob toi too tos tot tou tox tsa tsb tsi tso tss tst tsu tsx tta ttb tti tto tts ttt ttu ttx tua tub tui tuo tus tut tuu tux txi txs txt txu ua- uaa uab uai uao uas uat uau uba ubb ubi ubo ubs ubt ubu ubx uia uib uii uio uis uit uiu uoa uob uoo uos uot uox usa usb usi uso uss ust usu usx uta utb uti uto uts utt utu utx uua uus uut uuu uxb uxo uxt uxu xaa xas xat xau xbx xia xii xio xis xit xiu xix xoa xoi xoo xos xot xox xsa xsb xsi xss xst xti xts xtx xui xus xxi xxo xxx