a-a a-b a-c aaa aab aac aad aae aak aan aap aas ab- aba abb abc abd abe abk abn abp abs ac- aca acb acc acd ace ack acn acp acs ad- ada adb adc add ade adk adn adp ads aea aeb aec aed aee aek aen aep aes aka akb akc akd ake akk akn akp aks an- ana anb anc and ane ank ann anp ans ap- apa apb apc apd ape apk apn app aps as- asa asb asc asd ase ask asn asp ass b-p baa bab bac bad bae bak ban bap bas bba bbb bbc bbd bbe bbk bbn bbp bbs bca bcb bcc bcd bce bck bcn bcp bcs bda bdb bdc bdd bde bdk bdp bds be- bea beb bec bed bee bek ben bep bes bka bkb bkc bke bkk bkn bkp bks bna bnb bnc bnd bne bnk bnn bnp bns bpa bpb bpc bpd bpe bpn bpp bps bsa bsb bsc bsd bse bsk bsn bsp bss c-- caa cab cac cad cae cak can cap cas cba cbb cbc cbd cbe cbk cbn cbp cbs cca ccb ccc ccd cce cck ccn ccp ccs cda cdb cdc cdd cde cdk cdn cdp cds ce- cea ceb cec ced cee cek cen cep ces cka ckb ckc ckd cks cn- cna cnb cnc cnd cne cnn cnp cns cpa cpb cpc cpd cpe cpk cpn cpp cps csa csb csc csd cse csk csn csp css daa dab dac dad dae dak dan dap das dba dbb dbc dbd dbe dbk dbn dbp dbs dca dcb dcc dcd dce dck dcn dcp dcs dda ddb ddc ddd dde ddk ddn ddp dds de- dea deb dec ded dee dek den dep des dka dkb dkc dke dkk dkp dks dna dnb dnc dnd dne dnk dnn dnp dns dpa dpb dpc dpd dpe dpk dpn dpp dps dsa dsb dsc dsd dse dsk dsn dsp dss eaa eab eac ead eae eak ean eap eas eba ebb ebc ebd ebe ebk ebn ebp ebs ec- eca ecb ecc ecd ece eck ecn ecs ed- eda edb edc edd ede edk edn edp eds eea eeb eec eed eee eek een eep ees eka ekb ekc ekd eke ekp eks en- ena enb enc end ene enk enn enp ens ep- epa epb epc epd epe epn epp eps es- esa esb esc esd ese esk esn esp ess ka- kaa kab kac kad kae kak kan kap kas kba kbb kbc kbd kbe kbk kbn kbp kbs kca kcb kcc kcd kce kck kcn kcp kcs kda kdb kdc kde kdk kdp kds ke- kea keb kec ked kee kek ken kep kes kkb kkc kke kkk kkn kkp kks kn- kna knc knd kne knk knn knp kpa kpc kpd kpe kpk kpn kpp kps ksa ksb ksc ksd kse ksk ksn ksp kss naa nab nac nad nae nak nan nap nas nba nbb nbc nbd nbe nbk nbn nbp nbs nca ncb ncc ncd nce nck ncn ncp ncs nda ndb ndc ndd nde ndk ndn ndp nds ne- nea neb nec ned nee nek nen nep nes nka nkc nke nkk nkn nkp nks nna nnb nnc nne nnk nnn nnp nns npa npb npc npd npe npn npp nps nsa nsb nsc nsd nse nsk nsn nsp nss p-p paa pab pac pad pae pak pan pap pas pba pbb pbc pbd pbe pbk pbn pbp pbs pca pcb pcc pcd pce pck pcn pcp pcs pda pdb pdc pdd pde pdk pdn pdp pds pea peb pec ped pee pek pen pep pes pka pkb pkc pkd pke pkn pkp pks pn- pna pnb pnc pnd pne pnk pnn pnp pns ppa ppb ppc ppd ppe ppk ppn ppp pps ps- psa psb psc psd pse psk psn psp pss saa sab sac sad sae sak san sap sas sba sbb sbc sbd sbe sbk sbn sbp sbs sca scb scc scd sce sck scn scp scs sda sdb sdc sdd sde sdk sdn sdp sds se- sea seb sec sed see sek sen sep ses sk- ska skb skc skd ske skk skp sks sna snb snc snd sne snk snn snp sns spa spb spc spd spe spk spn spp sps ss- ssa ssb ssc ssd sse ssk ssn ssp sss