-ic a-a a-b a-c a-i aaa aab aac aae aai aan aap ab- aba abb abc abe abi abn abp ac- aca acb acc ace aci acn acp aea aeb aec aee aei aen aep ai- aia aib aic aie aii ain aip an- ana anb anc ane ani ann anp ap- apa apb apc ape api apn app b-p baa bab bac bae bai ban bap bba bbb bbc bbe bbi bbn bbp bca bcb bcc bce bci bcn bcp be- bea beb bec bee bei ben bep bi- bia bib bic bie bii bin bip bna bnb bnc bne bni bnn bnp bpa bpb bpc bpe bpi bpn bpp c-- caa cab cac cae cai can cap cba cbb cbc cbe cbi cbn cbp cca ccb ccc cce cci ccn ccp ce- cea ceb cec cee cei cen cep ci- cia cib cic cie cii cin cip cn- cna cnb cnc cne cni cnn cnp cpa cpb cpc cpe cpi cpn cpp eaa eab eac eae eai ean eap eba ebb ebc ebe ebi ebn ebp ec- eca ecb ecc ece eci ecn eea eeb eec eee een eep eia eib eic eie eii ein eip en- ena enb enc ene eni enn enp ep- epa epb epc epe epi epn epp ia- iaa iab iac iae iai ian iap iba ibb ibc ibe ibi ibn ibp ica icb icc ice ici icn icp ie- iea iec iee iei ien iep iia iib iic iie iii iin iip in- ina inb inc ine ini inn inp ipa ipb ipc ipe ipi ipn ipp n-i naa nab nac nae nai nan nap nba nbb nbc nbe nbi nbn nbp nca ncb ncc nce nci ncn ncp ne- nea neb nec nee nei nen nep nia nib nic nie nii nin nip nna nnb nnc nne nni nnn nnp npa npb npc npe npi npn npp p-p paa pab pac pae pai pan pap pba pbb pbc pbe pbi pbn pbp pca pcb pcc pce pci pcn pcp pea peb pec pee pei pen pep pia pib pic pie pii pin pip pn- pna pnb pnc pne pni pnn pnp ppa ppb ppc ppe ppi ppn ppp