-ic a-a a-b a-c a-i aaa aab aac aai aak aan aap ab- aba abb abc abi abk abn abp ac- aca acb acc aci ack acn acp ai- aia aib aic aii aik ain aip aka akb akc aki akk akn akp an- ana anb anc ani ank ann anp ap- apa apb apc api apk apn app b-p baa bab bac bai bak ban bap bba bbb bbc bbi bbk bbn bbp bca bcb bcc bci bck bcn bcp bi- bia bib bic bii bik bin bip bka bkb bkc bkk bkn bkp bna bnb bnc bni bnk bnn bnp bpa bpb bpc bpi bpn bpp c-- caa cab cac cai cak can cap cba cbb cbc cbi cbk cbn cbp cca ccb ccc cci cck ccn ccp ci- cia cib cic cii cik cin cip cka ckb ckc cki cn- cna cnb cnc cni cnn cnp cpa cpb cpc cpi cpk cpn cpp ia- iaa iab iac iai ian iap iba ibb ibc ibi ibk ibn ibp ica icb icc ici ick icn icp iia iib iic iii iin iip ika ikb ikc iki ikk in- ina inb inc ini ink inn inp ipa ipb ipc ipi ipn ipp ka- kaa kab kac kai kak kan kap kba kbb kbc kbi kbk kbn kbp kca kcb kcc kci kck kcn kcp kia kib kic kii kik kin kip kkb kkc kki kkk kkn kkp kn- kna knc kni knk knn knp kpa kpc kpi kpk kpn kpp n-i naa nab nac nai nak nan nap nba nbb nbc nbi nbk nbn nbp nca ncb ncc nci nck ncn ncp nia nib nic nii nik nin nip nka nkc nki nkk nkn nkp nna nnb nnc nni nnk nnn nnp npa npb npc npi npn npp p-p paa pab pac pai pak pan pap pba pbb pbc pbi pbk pbn pbp pca pcb pcc pci pck pcn pcp pia pib pic pii pik pin pip pka pkb pkc pki pkn pkp pn- pna pnb pnc pni pnk pnn pnp ppa ppb ppc ppi ppk ppn ppp