-ic a-a a-b a-c a-i aaa aab aac aae aai aak aap ab- aba abb abc abe abi abk abp ac- aca acb acc ace aci ack acp aea aeb aec aee aei aek aep ai- aia aib aic aie aii aik aip aka akb akc ake aki akk akp ap- apa apb apc ape api apk app b-p baa bab bac bae bai bak bap bba bbb bbc bbe bbi bbk bbp bca bcb bcc bce bci bck bcp be- bea beb bec bee bei bek bep bi- bia bib bic bie bii bik bip bka bkb bkc bke bkk bkp bpa bpb bpc bpe bpi bpp c-- caa cab cac cae cai cak cap cba cbb cbc cbe cbi cbk cbp cca ccb ccc cce cci cck ccp ce- cea ceb cec cee cei cek cep ci- cia cib cic cie cii cik cip cka ckb ckc cki cpa cpb cpc cpe cpi cpk cpp eaa eab eac eae eai eak eap eba ebb ebc ebe ebi ebk ebp ec- eca ecb ecc ece eci eck eea eeb eec eee eek eep eia eib eic eie eii eik eip eka ekb ekc eke eki ekp ep- epa epb epc epe epi epp ia- iaa iab iac iae iai iap iba ibb ibc ibe ibi ibk ibp ica icb icc ice ici ick icp ie- iea iec iee iei iek iep iia iib iic iie iii iip ika ikb ikc ike iki ikk ipa ipb ipc ipe ipi ipp ka- kaa kab kac kae kai kak kap kba kbb kbc kbe kbi kbk kbp kca kcb kcc kce kci kck kcp ke- kea keb kec kee kei kek kep kia kib kic kie kii kik kip kkb kkc kke kki kkk kkp kpa kpc kpe kpi kpk kpp p-p paa pab pac pae pai pak pap pba pbb pbc pbe pbi pbk pbp pca pcb pcc pce pci pck pcp pea peb pec pee pei pek pep pia pib pic pie pii pik pip pka pkb pkc pke pki pkp ppa ppb ppc ppe ppi ppk ppp