a-a a-b a-t aaa aab aae aaf aao aas aat aau aax ab- aba abb abe abf abo abs abt abu abx aea aeb aee aef aeo aes aet aeu aex af- afa afb afe aff afo afs aft afu afx aoa aob aoe aof aoo aos aot aou aox as- asa asb ase asf aso ass ast asu asx at- ata atb ate atf ato ats att atu atx au- aua aub aue auf auo aus aut aux ax- axa axe axo axs axt axx b-u baa bab bae baf bao bas bat bau bax bba bbb bbe bbf bbo bbs bbt bbu bbx be- bea beb bee bef beo bes bet beu bex bfa bfb bfe bff bfo bfs bft bfu bfx boa bob boe bof boo bos bot bou box bsa bsb bse bsf bso bss bst bsu bsx bta btb bte btf bto bts btt btu btx bua bub bue buf buo bus but buu bux bxb bxo bxx eaa eab eae eaf eao eas eat eau eax eba ebb ebe ebf ebo ebs ebt ebu ebx eea eeb eee eef eeo ees eet eex ef- efa efb efe eff efo efs eft efx eo- eoa eob eoe eof eoo eos eot eou es- esa esb ese esf eso ess est esu esx eta etb ete etf eto ets ett etu etx eu- eua eub eue euf eus eut eux ex- exa exe exo exs ext exu exx faa fab fae faf fao fas fat fau fax fba fbb fbe fbf fbo fbs fbt fbu fbx fea feb fee fef feo fes fet feu fex ffa ffe fff ffo ffs fft ffu ffx foa fob foe fof foo fos fot fou fox fsa fsb fse fsf fso fss fst fsu fsx fta ftb fte ftf fto fts ftt ftu ftx fua fub fue fuf fuo fus fut fuu fux fxe fxs fxt fxu fxx oaa oab oae oaf oao oas oat oau oax ob- oba obb obe obf obo obs obt obu obx oea oeb oee oef oeo oes oet oex of- ofa ofb ofe off ofo ofs oft ofu ofx oo- ooa oob oof ooo oos oot oox os- osa osb ose osf oso oss ost osu osx ot- ota otb ote otf oto ots ott otu ou- oua oue ouf ouo ous out ox- oxa oxb oxf oxo oxt oxx saa sab sae saf sao sas sat sau sax sba sbb sbe sbf sbo sbs sbt sbu sbx se- sea seb see sef seo ses set seu sex sfa sfb sfe sff sfo sfs sft sfu sfx soa sob soe sof soo sos sot sou sox ss- ssa ssb sse ssf sso sss sst ssu ssx sta stb ste stf sto sts stt stu stx sua sub sue suf suo sus sut suu sux sxs sxt sxu t-x taa tab tae taf tao tas tat tau tax tba tbb tbe tbf tbo tbs tbt tbu te- tea teb tee tef teo tes tet teu tex tfa tfb tfe tff tfo tfs tft tfu tfx to- toa tob toe tof too tos tot tou tox tsa tsb tse tsf tso tss tst tsu tsx tta ttb tte ttf tto tts ttt ttu ttx tua tub tue tuf tuo tus tut tuu tux txe txf txs txt txu ua- uaa uab uae uaf uao uas uat uau uba ubb ube ubf ubo ubs ubt ubu ubx uea ueb uee uef ues uet ufa ufe uff ufo ufs uft ufu ufx uoa uob uoe uoo uos uot uox usa usb use usf uso uss ust usu usx uta utb ute utf uto uts utt utu utx uua uue uus uut uuu uxb uxf uxo uxt uxu xaa xaf xas xat xau xbe xbx xee xes xet xeu xex xfa xfe xfs xft xfx xoa xof xoo xos xot xox xsa xsb xss xst xtf xts xtx xue xus xxo xxx