a-a a-b a-c a-t aaa aab aac aad aak aan aas aat ab- aba abb abc abd abk abn abs abt ac- aca acb acc acd ack acn acs act ad- ada adb adc add adk adn ads adt aka akb akc akd akk akn aks an- ana anb anc and ank ann ans ant as- asa asb asc asd ask asn ass ast at- ata atb atc atd atn ats att baa bab bac bad bak ban bas bat bba bbb bbc bbd bbk bbn bbs bbt bca bcb bcc bcd bck bcn bcs bct bda bdb bdc bdd bdk bds bdt bka bkb bkc bkk bkn bks bkt bna bnb bnc bnd bnk bnn bns bnt bsa bsb bsc bsd bsk bsn bss bst bta btb btc btd btk btn bts btt c-- caa cab cac cad cak can cas cat cba cbb cbc cbd cbk cbn cbs cbt cca ccb ccc ccd cck ccn ccs cct cda cdb cdc cdd cdk cdn cds cdt cka ckb ckc ckd cks ckt cn- cna cnb cnc cnd cnn cns cnt csa csb csc csd csk csn css cst cta ctb ctc ctd ctk ctn cts ctt daa dab dac dad dak dan das dat dba dbb dbc dbd dbk dbn dbs dbt dca dcb dcc dcd dck dcn dcs dct dda ddb ddc ddd ddk ddn dds ddt dka dkb dkc dkk dks dkt dna dnb dnc dnd dnk dnn dns dnt dsa dsb dsc dsd dsk dsn dss dst dta dtb dtc dtd dtk dtn dts dtt k-t ka- kaa kab kac kad kak kan kas kat kba kbb kbc kbd kbk kbn kbs kca kcb kcc kcd kck kcn kcs kct kda kdb kdc kdk kds kdt kkb kkc kkk kkn kks kkt kn- kna knc knd knk knn knt ksa ksb ksc ksd ksk ksn kss kst kta ktb ktc ktk ktn kts ktt naa nab nac nad nak nan nas nat nba nbb nbc nbd nbk nbn nbs nbt nca ncb ncc ncd nck ncn ncs nct nda ndb ndc ndd ndk ndn nds ndt nka nkc nkk nkn nks nkt nna nnb nnc nnk nnn nns nnt nsa nsb nsc nsd nsk nsn nss nst nta ntb ntc ntd ntk ntn nts ntt saa sab sac sad sak san sas sat sba sbb sbc sbd sbk sbn sbs sbt sca scb scc scd sck scn scs sct sda sdb sdc sdd sdk sdn sds sdt sk- ska skb skc skd skk sks skt sna snb snc snd snk snn sns snt ss- ssa ssb ssc ssd ssk ssn sss sst sta stb stc std stk stn sts stt taa tab tac tad tak tan tas tat tba tbb tbc tbd tbk tbn tbs tbt tca tcb tcc tcd tck tcn tcs tct tda tdb tdc tdd tdk tdn tds tdt tka tkb tkc tkk tks tkt tna tnb tnc tnd tnk tnn tns tnt tsa tsb tsc tsd tsk tsn tss tst tta ttb ttc ttd ttk ttn tts ttt