-ic a-a a-b a-c a-i aaa aab aac aai aak aap aar ab- aba abb abc abi abk abp abr ac- aca acb acc aci ack acp acr ai- aia aib aic aii aik aip air aka akb akc aki akk akp akr ap- apa apb apc api apk app apr ar- ara arb arc ari ark arp arr b-p baa bab bac bai bak bap bar bba bbb bbc bbi bbk bbp bbr bca bcb bcc bci bck bcp bcr bi- bia bib bic bii bik bip bir bka bkb bkc bkk bkp bkr bpa bpb bpc bpi bpp bpr bra brb bri brk brp brr c-- caa cab cac cai cak cap car cba cbb cbc cbi cbk cbp cbr cca ccb ccc cci cck ccp ccr ci- cia cib cic cii cik cip cir cka ckb ckc cki cpa cpb cpc cpi cpk cpp cpr cra crb crc cri crk crp crr ia- iaa iab iac iai iap iar iba ibb ibc ibi ibk ibp ibr ica icb icc ici ick icp icr iia iib iic iii iip iir ika ikb ikc iki ikk ikr ipa ipb ipc ipi ipp ipr ir- ira irb irc iri irk irp irr ka- kaa kab kac kai kak kap kar kba kbb kbc kbi kbk kbp kbr kca kcb kcc kci kck kcp kcr kia kib kic kii kik kip kir kkb kkc kki kkk kkp kkr kpa kpc kpi kpk kpp kpr kra krc kri krk krp krr p-p paa pab pac pai pak pap par pba pbb pbc pbi pbk pbp pbr pca pcb pcc pci pck pcp pcr pia pib pic pii pik pip pir pka pkb pkc pki pkp pkr ppa ppb ppc ppi ppk ppp ppr pra prb prc pri prk prp prr ra- raa rab rac rai rak rap rar rba rbb rbc rbi rbk rbp rbr rca rcb rcc rci rcp rcr ria rib ric rii rik rip rir rkb rkc rkk rkp rpa rpb rpc rpi rpk rpp rpr rra rrb rrc rri rrk rrp rrr