a-a a-b a-t aaa aab aad aae aak aan aao aas aat ab- aba abb abd abe abk abn abo abs abt ad- ada adb add ade adk adn ado ads adt aea aeb aed aee aek aen aeo aes aet aka akb akd ake akk akn ako aks an- ana anb and ane ank ann ano ans ant aoa aob aod aoe aok aon aoo aos aot as- asa asb asd ase ask asn aso ass ast at- ata atb atd ate atn ato ats att baa bab bad bae bak ban bao bas bat bba bbb bbd bbe bbk bbn bbo bbs bbt bda bdb bdd bde bdk bdo bds bdt be- bea beb bed bee bek ben beo bes bet bka bkb bke bkk bkn bko bks bkt bna bnb bnd bne bnk bnn bno bns bnt boa bob bod boe bok bon boo bos bot bsa bsb bsd bse bsk bsn bso bss bst bta btb btd bte btk btn bto bts btt daa dab dad dae dak dan dao das dat dba dbb dbd dbe dbk dbn dbo dbs dbt dda ddb ddd dde ddk ddn ddo dds ddt de- dea deb ded dee dek den deo des det dka dkb dke dkk dko dks dkt dna dnb dnd dne dnk dnn dno dns dnt doa dob dod doe dok don doo dos dot dsa dsb dsd dse dsk dsn dso dss dst dta dtb dtd dte dtk dtn dto dts dtt eaa eab ead eae eak ean eao eas eat eba ebb ebd ebe ebk ebn ebo ebs ebt ed- eda edb edd ede edk edn edo eds edt eea eeb eed eee eek een eeo ees eet eka ekb ekd eke eko eks ekt en- ena enb end ene enk enn eno ens ent eo- eoa eob eod eoe eok eon eoo eos eot es- esa esb esd ese esk esn eso ess est eta etb etd ete etk etn eto ets ett k-t ka- kaa kab kad kae kak kan kao kas kat kba kbb kbd kbe kbk kbn kbo kbs kda kdb kde kdk kdo kds kdt ke- kea keb ked kee kek ken keo kes ket kkb kke kkk kkn kks kkt kn- kna knd kne knk knn kno knt koa kob kod koe kok kon koo kos kot ksa ksb ksd kse ksk ksn kso kss kst kta ktb kte ktk ktn kto kts ktt naa nab nad nae nak nan nao nas nat nba nbb nbd nbe nbk nbn nbo nbs nbt nda ndb ndd nde ndk ndn ndo nds ndt ne- nea neb ned nee nek nen neo nes net nka nke nkk nkn nko nks nkt nna nnb nne nnk nnn nno nns nnt no- noa nob nod noe nok non noo nos not nsa nsb nsd nse nsk nsn nso nss nst nta ntb ntd nte ntk ntn nto nts ntt oaa oab oad oae oak oan oao oas oat ob- oba obb obd obe obk obn obo obs obt oda odb odd ode odn odo ods odt oea oeb oed oee oen oeo oes oet oka okb okd oke okk oko oks on- ona onb ond one onk onn ono ons ont oo- ooa oob ood ook oon ooo oos oot os- osa osb osd ose osk osn oso oss ost ot- ota otb otd ote otk otn oto ots ott saa sab sad sae sak san sao sas sat sba sbb sbd sbe sbk sbn sbo sbs sbt sda sdb sdd sde sdk sdn sdo sds sdt se- sea seb sed see sek sen seo ses set sk- ska skb skd ske skk sko sks skt sna snb snd sne snk snn sno sns snt soa sob sod soe sok son soo sos sot ss- ssa ssb ssd sse ssk ssn sso sss sst sta stb std ste stk stn sto sts stt taa tab tad tae tak tan tao tas tat tba tbb tbd tbe tbk tbn tbo tbs tbt tda tdb tdd tde tdk tdn tdo tds tdt te- tea teb ted tee tek ten teo tes tet tka tkb tke tkk tko tks tkt tna tnb tnd tne tnk tnn tno tns tnt to- toa tob tod toe tok ton too tos tot tsa tsb tsd tse tsk tsn tso tss tst tta ttb ttd tte ttk ttn tto tts ttt