-er a-a a-b a-t aaa aab aae aan aar aas aat aau aax ab- aba abb abe abn abr abs abt abu abx aea aeb aee aen aer aes aet aeu aex an- ana anb ane ann anr ans ant anu anx ar- ara arb are arn arr ars art aru arx as- asa asb ase asn asr ass ast asu asx at- ata atb ate atn atr ats att atu atx au- aua aub aue aun aur aus aut aux ax- axa axe axn axr axs axt axx b-u baa bab bae ban bar bas bat bau bax bba bbb bbe bbn bbr bbs bbt bbu bbx be- bea beb bee ben ber bes bet beu bex bna bnb bne bnn bnr bns bnt bnu bnx bra brb bre brn brr brs brt bru brx bsa bsb bse bsn bsr bss bst bsu bsx bta btb bte btn btr bts btt btu btx bua bub bue bun bur bus but buu bux bxb bxn bxx eaa eab eae ean ear eas eat eau eax eba ebb ebe ebn ebr ebs ebt ebu ebx eea eeb eee een eer ees eet eex en- ena enb ene enn enr ens ent enu era erb ere ern err ers ert eru es- esa esb ese esn esr ess est esu esx eta etb ete etn etr ets ett etu etx eu- eua eub eue eun eur eus eut eux ex- exa exe exr exs ext exu exx naa nab nae nan nar nas nat nau nax nba nbb nbe nbn nbr nbs nbt nbu nbx ne- nea neb nee nen ner nes net neu nex nna nnb nne nnn nns nnt nnu nra nrb nre nrn nrr nrs nrt nru nrx nsa nsb nse nsn nsr nss nst nsu nsx nta ntb nte ntn ntr nts ntt ntu ntx nua nub nue nun nur nus nut nuu nux nxt ra- raa rab rae ran rar ras rat rau rax rba rbb rbe rbn rbr rbs rbt rbu rbx re- rea reb ree ren rer res ret reu rex rna rnb rnn rnr rns rnt rnu rra rrb rrn rrr rrs rrt rru rsa rsb rse rsn rsr rss rst rsu rsx rta rtb rte rtn rtr rts rtt rtu rtx rua rub rue run rur rus rut ruu rux rxr rxs saa sab sae san sar sas sat sau sax sba sbb sbe sbn sbr sbs sbt sbu sbx se- sea seb see sen ser ses set seu sex sna snb sne snn snr sns snt snu sr- sra srb sre srn srr srs srt srx ss- ssa ssb sse ssn ssr sss sst ssu ssx sta stb ste stn str sts stt stu stx sua sub sue sun sur sus sut suu sux sxn sxs sxt sxu t-x taa tab tae tan tar tas tat tau tax tba tbb tbe tbn tbr tbs tbt tbu te- tea teb tee ten ter tes tet teu tex tna tnb tne tnn tnr tns tnt tnx tra trb tre trn trr trs trt tru trx tsa tsb tse tsn tsr tss tst tsu tsx tta ttb tte ttn ttr tts ttt ttu ttx tua tub tue tun tur tus tut tuu tux txe txn txs txt txu ua- uaa uab uae uan uar uas uat uau uba ubb ube ubn ubr ubs ubt ubu ubx uea ueb uee uen uer ues uet un- una unb une unn unr uns unt unu unx ur- ura urb ure urn urr urs urt uru urx usa usb use usn usr uss ust usu usx uta utb ute utn utr uts utt utu utx uua uue uun uur uus uut uuu uxb uxr uxt uxu xaa xan xar xas xat xau xbe xbr xbx xee xen xer xes xet xeu xex xna xns xnu xrt xrx xsa xsb xss xst xtr xts xtx xue xun xus xxx