a-a a-b a-t aaa aab aad aak aan aas aat ab- aba abb abd abk abn abs abt ad- ada adb add adk adn ads adt aka akb akd akk akn aks an- ana anb and ank ann ans ant as- asa asb asd ask asn ass ast at- ata atb atd atn ats att baa bab bad bak ban bas bat bba bbb bbd bbk bbn bbs bbt bda bdb bdd bdk bds bdt bka bkb bkk bkn bks bkt bna bnb bnd bnk bnn bns bnt bsa bsb bsd bsk bsn bss bst bta btb btd btk btn bts btt daa dab dad dak dan das dat dba dbb dbd dbk dbn dbs dbt dda ddb ddd ddk ddn dds ddt dka dkb dkk dks dkt dna dnb dnd dnk dnn dns dnt dsa dsb dsd dsk dsn dss dst dta dtb dtd dtk dtn dts dtt k-t ka- kaa kab kad kak kan kas kat kba kbb kbd kbk kbn kbs kda kdb kdk kds kdt kkb kkk kkn kks kkt kn- kna knd knk knn knt ksa ksb ksd ksk ksn kss kst kta ktb ktk ktn kts ktt naa nab nad nak nan nas nat nba nbb nbd nbk nbn nbs nbt nda ndb ndd ndk ndn nds ndt nka nkk nkn nks nkt nna nnb nnk nnn nns nnt nsa nsb nsd nsk nsn nss nst nta ntb ntd ntk ntn nts ntt saa sab sad sak san sas sat sba sbb sbd sbk sbn sbs sbt sda sdb sdd sdk sdn sds sdt sk- ska skb skd skk sks skt sna snb snd snk snn sns snt ss- ssa ssb ssd ssk ssn sss sst sta stb std stk stn sts stt taa tab tad tak tan tas tat tba tbb tbd tbk tbn tbs tbt tda tdb tdd tdk tdn tds tdt tka tkb tkk tks tkt tna tnb tnd tnk tnn tns tnt tsa tsb tsd tsk tsn tss tst tta ttb ttd ttk ttn tts ttt