-er a-a a-c a-t aaa aac aae aao aar aat aau aax ac- aca acc ace aco acr act acu acx aea aec aee aeo aer aet aeu aex aoa aoc aoe aoo aor aot aou aox ar- ara arc are aro arr art aru arx at- ata atc ate ato atr att atu atx au- aua auc aue auo aur aut aux ax- axa axe axo axr axt axx c-- caa cac cae cao car cat cau cax cca ccc cce cco ccr cct ccu ccx ce- cea cec cee ceo cer cet ceu cex co- coa coc coe coo cor cot cou cox cra crc cre cro crr crt cru crx cta ctc cte cto ctr ctt ctu ctx cua cuc cue cuo cur cut cuu cxc cxo cxr cxt cxx eaa eac eae eao ear eat eau eax ec- eca ecc ece eco ecr ect ecu ecx eea eec eee eeo eer eet eex eo- eoa eoc eoe eoo eor eot eou era erc ere ero err ert eru eta etc ete eto etr ett etu etx eu- eua euc eue eur eut eux ex- exa exc exe exo exr ext exu exx oaa oac oae oao oar oat oau oax oc- oca occ oco ocr oct ocu ocx oea oec oee oeo oer oet oex oo- ooa ooc ooo oor oot oox or- ora orc ore oro orr ort oru orx ot- ota otc ote oto otr ott otu ou- oua ouc oue ouo our out ox- oxa oxc oxo oxt oxx ra- raa rac rae rao rar rat rau rax rca rcc rce rco rcr rct rcu rcx re- rea rec ree reo rer ret reu rex roa roc roe roo ror rot rou rox rra rrc rrr rrt rru rta rtc rte rto rtr rtt rtu rtx rua ruc rue ruo rur rut ruu rux rxr t-x taa tac tae tao tar tat tau tax tca tcc tce tco tcr tct tcu tcx te- tea tec tee teo ter tet teu tex to- toa toc toe too tor tot tou tox tra trc tre tro trr trt tru trx tta ttc tte tto ttr ttt ttu ttx tua tuc tue tuo tur tut tuu tux txe txt txu ua- uaa uac uae uao uar uat uau uca ucc uce uco ucr uct ucu uea uec uee uer uet uoa uoc uoe uoo uor uot uox ur- ura urc ure uro urr urt uru urx uta utc ute uto utr utt utu utx uua uuc uue uur uut uuu uxc uxo uxr uxt uxu xaa xac xar xat xau xcr xcx xee xer xet xeu xex xoa xoc xoo xor xot xox xrc xrt xrx xtc xtr xtx xue xxo xxx