-ic a-a a-b a-c a-i aaa aab aac aai aak aan aap aas ab- aba abb abc abi abk abn abp abs ac- aca acb acc aci ack acn acp acs ai- aia aib aic aii aik ain aip ais aka akb akc aki akk akn akp aks an- ana anb anc ani ank ann anp ans ap- apa apb apc api apk apn app aps as- asa asb asc asi ask asn asp ass b-p baa bab bac bai bak ban bap bas bba bbb bbc bbi bbk bbn bbp bbs bca bcb bcc bci bck bcn bcp bcs bi- bia bib bic bii bik bin bip bis bka bkb bkc bkk bkn bkp bks bna bnb bnc bni bnk bnn bnp bns bpa bpb bpc bpi bpn bpp bps bsa bsb bsc bsi bsk bsn bsp bss c-- caa cab cac cai cak can cap cas cba cbb cbc cbi cbk cbn cbp cbs cca ccb ccc cci cck ccn ccp ccs ci- cia cib cic cii cik cin cip cis cka ckb ckc cki cks cn- cna cnb cnc cni cnn cnp cns cpa cpb cpc cpi cpk cpn cpp cps csa csb csc csi csk csn csp css ia- iaa iab iac iai ian iap ias iba ibb ibc ibi ibk ibn ibp ibs ica icb icc ici ick icn icp ics iia iib iic iii iin iip iis ika ikb ikc iki ikk iks in- ina inb inc ini ink inn inp ins ipa ipb ipc ipi ipn ipp ips is- isa isb isc isi isk isn isp iss ka- kaa kab kac kai kak kan kap kas kba kbb kbc kbi kbk kbn kbp kbs kca kcb kcc kci kck kcn kcp kcs kia kib kic kii kik kin kip kis kkb kkc kki kkk kkn kkp kks kn- kna knc kni knk knn knp kpa kpc kpi kpk kpn kpp kps ksa ksb ksc ksi ksk ksn ksp kss n-i naa nab nac nai nak nan nap nas nba nbb nbc nbi nbk nbn nbp nbs nca ncb ncc nci nck ncn ncp ncs nia nib nic nii nik nin nip nis nka nkc nki nkk nkn nkp nks nna nnb nnc nni nnk nnn nnp nns npa npb npc npi npn npp nps nsa nsb nsc nsi nsk nsn nsp nss p-p paa pab pac pai pak pan pap pas pba pbb pbc pbi pbk pbn pbp pbs pca pcb pcc pci pck pcn pcp pcs pia pib pic pii pik pin pip pis pka pkb pkc pki pkn pkp pks pn- pna pnb pnc pni pnk pnn pnp pns ppa ppb ppc ppi ppk ppn ppp pps ps- psa psb psc psi psk psn psp pss saa sab sac sai sak san sap sas sba sbb sbc sbi sbk sbn sbp sbs sca scb scc sci sck scn scp scs sia sib sic sii sik sin sip sis sk- ska skb skc ski skk skp sks sna snb snc sni snk snn snp sns spa spb spc spi spk spn spp sps ss- ssa ssb ssc ssi ssk ssn ssp sss