a-a a-b a-c a-t aaa aab aac aae aak aap aas aat ab- aba abb abc abe abk abp abs abt ac- aca acb acc ace ack acp acs act aea aeb aec aee aek aep aes aet aka akb akc ake akk akp aks ap- apa apb apc ape apk app aps apt as- asa asb asc ase ask asp ass ast at- ata atb atc ate atp ats att b-p baa bab bac bae bak bap bas bat bba bbb bbc bbe bbk bbp bbs bbt bca bcb bcc bce bck bcp bcs bct be- bea beb bec bee bek bep bes bet bka bkb bkc bke bkk bkp bks bkt bpa bpb bpc bpe bpp bps bpt bsa bsb bsc bse bsk bsp bss bst bta btb btc bte btk btp bts btt c-- caa cab cac cae cak cap cas cat cba cbb cbc cbe cbk cbp cbs cbt cca ccb ccc cce cck ccp ccs cct ce- cea ceb cec cee cek cep ces cet cka ckb ckc cks ckt cpa cpb cpc cpe cpk cpp cps cpt csa csb csc cse csk csp css cst cta ctb ctc cte ctk ctp cts ctt eaa eab eac eae eak eap eas eat eba ebb ebc ebe ebk ebp ebs ebt ec- eca ecb ecc ece eck ecs ect eea eeb eec eee eek eep ees eet eka ekb ekc eke ekp eks ekt ep- epa epb epc epe epp eps ept es- esa esb esc ese esk esp ess est eta etb etc ete etk etp ets ett k-t ka- kaa kab kac kae kak kap kas kat kba kbb kbc kbe kbk kbp kbs kca kcb kcc kce kck kcp kcs kct ke- kea keb kec kee kek kep kes ket kkb kkc kke kkk kkp kks kkt kpa kpc kpe kpk kpp kps kpt ksa ksb ksc kse ksk ksp kss kst kta ktb ktc kte ktk ktp kts ktt p-p paa pab pac pae pak pap pas pat pba pbb pbc pbe pbk pbp pbs pbt pca pcb pcc pce pck pcp pcs pct pea peb pec pee pek pep pes pet pka pkb pkc pke pkp pks pkt ppa ppb ppc ppe ppk ppp pps ppt ps- psa psb psc pse psk psp pss pst pt- pta ptb ptc pte ptk ptp pts ptt saa sab sac sae sak sap sas sat sba sbb sbc sbe sbk sbp sbs sbt sca scb scc sce sck scp scs sct se- sea seb sec see sek sep ses set sk- ska skb skc ske skk skp sks skt spa spb spc spe spk spp sps spt ss- ssa ssb ssc sse ssk ssp sss sst sta stb stc ste stk stp sts stt taa tab tac tae tak tap tas tat tba tbb tbc tbe tbk tbp tbs tbt tca tcb tcc tce tck tcp tcs tct te- tea teb tec tee tek tep tes tet tka tkb tkc tke tkk tkp tks tkt tpa tpb tpc tpe tpk tpp tps tpt tsa tsb tsc tse tsk tsp tss tst tta ttb ttc tte ttk ttp tts ttt