a-a a-b a-t aaa aab aad aae aan aas aat aau ab- aba abb abd abe abn abs abt abu ad- ada adb add ade adn ads adt adu aea aeb aed aee aen aes aet aeu an- ana anb and ane ann ans ant anu as- asa asb asd ase asn ass ast asu at- ata atb atd ate atn ats att atu au- aua aub aud aue aun aus aut b-u baa bab bad bae ban bas bat bau bba bbb bbd bbe bbn bbs bbt bbu bda bdb bdd bde bds bdt bdu be- bea beb bed bee ben bes bet beu bna bnb bnd bne bnn bns bnt bnu bsa bsb bsd bse bsn bss bst bsu bta btb btd bte btn bts btt btu bua bub bud bue bun bus but buu daa dab dad dae dan das dat dau dba dbb dbd dbe dbn dbs dbt dbu dda ddb ddd dde ddn dds ddt ddu de- dea deb ded dee den des det deu dna dnb dnd dne dnn dns dnt dsa dsb dsd dse dsn dss dst dsu dta dtb dtd dte dtn dts dtt dtu dua dub dud due dun dus dut eaa eab ead eae ean eas eat eau eba ebb ebd ebe ebn ebs ebt ebu ed- eda edb edd ede edn eds edt edu eea eeb eed eee een ees eet en- ena enb end ene enn ens ent enu es- esa esb esd ese esn ess est esu eta etb etd ete etn ets ett etu eu- eua eub eud eue eun eus eut naa nab nad nae nan nas nat nau nba nbb nbd nbe nbn nbs nbt nbu nda ndb ndd nde ndn nds ndt ndu ne- nea neb ned nee nen nes net neu nna nnb nne nnn nns nnt nnu nsa nsb nsd nse nsn nss nst nsu nta ntb ntd nte ntn nts ntt ntu nua nub nud nue nun nus nut nuu saa sab sad sae san sas sat sau sba sbb sbd sbe sbn sbs sbt sbu sda sdb sdd sde sdn sds sdt sdu se- sea seb sed see sen ses set seu sna snb snd sne snn sns snt snu ss- ssa ssb ssd sse ssn sss sst ssu sta stb std ste stn sts stt stu sua sub sud sue sun sus sut suu taa tab tad tae tan tas tat tau tba tbb tbd tbe tbn tbs tbt tbu tda tdb tdd tde tdn tds tdt tdu te- tea teb ted tee ten tes tet teu tna tnb tnd tne tnn tns tnt tsa tsb tsd tse tsn tss tst tsu tta ttb ttd tte ttn tts ttt ttu tua tub tud tue tun tus tut tuu ua- uaa uab uad uae uan uas uat uau uba ubb ube ubn ubs ubt ubu uda udb udd ude udn uds udt udu uea ueb ued uee uen ues uet un- una unb und une unn uns unt unu usa usb usd use usn uss ust usu uta utb utd ute utn uts utt utu uua uue uun uus uut uuu