a-a a-b a-c aaa aab aac aak aan aap aas ab- aba abb abc abk abn abp abs ac- aca acb acc ack acn acp acs aka akb akc akk akn akp aks an- ana anb anc ank ann anp ans ap- apa apb apc apk apn app aps as- asa asb asc ask asn asp ass b-p baa bab bac bak ban bap bas bba bbb bbc bbk bbn bbp bbs bca bcb bcc bck bcn bcp bcs bka bkb bkc bkk bkn bkp bks bna bnb bnc bnk bnn bnp bns bpa bpb bpc bpn bpp bps bsa bsb bsc bsk bsn bsp bss c-- caa cab cac cak can cap cas cba cbb cbc cbk cbn cbp cbs cca ccb ccc cck ccn ccp ccs cka ckb ckc cks cn- cna cnb cnc cnn cnp cns cpa cpb cpc cpk cpn cpp cps csa csb csc csk csn csp css ka- kaa kab kac kak kan kap kas kba kbb kbc kbk kbn kbp kbs kca kcb kcc kck kcn kcp kcs kkb kkc kkk kkn kkp kks kn- kna knc knk knn knp kpa kpc kpk kpn kpp kps ksa ksb ksc ksk ksn ksp kss naa nab nac nak nan nap nas nba nbb nbc nbk nbn nbp nbs nca ncb ncc nck ncn ncp ncs nka nkc nkk nkn nkp nks nna nnb nnc nnk nnn nnp nns npa npb npc npn npp nps nsa nsb nsc nsk nsn nsp nss p-p paa pab pac pak pan pap pas pba pbb pbc pbk pbn pbp pbs pca pcb pcc pck pcn pcp pcs pka pkb pkc pkn pkp pks pn- pna pnb pnc pnk pnn pnp pns ppa ppb ppc ppk ppn ppp pps ps- psa psb psc psk psn psp pss saa sab sac sak san sap sas sba sbb sbc sbk sbn sbp sbs sca scb scc sck scn scp scs sk- ska skb skc skk skp sks sna snb snc snk snn snp sns spa spb spc spk spn spp sps ss- ssa ssb ssc ssk ssn ssp sss