-ic a-a a-b a-c a-i aaa aab aac aai aap aar ab- aba abb abc abi abp abr ac- aca acb acc aci acp acr ai- aia aib aic aii aip air ap- apa apb apc api app apr ar- ara arb arc ari arp arr b-p baa bab bac bai bap bar bba bbb bbc bbi bbp bbr bca bcb bcc bci bcp bcr bi- bia bib bic bii bip bir bpa bpb bpc bpi bpp bpr bra brb bri brp brr c-- caa cab cac cai cap car cba cbb cbc cbi cbp cbr cca ccb ccc cci ccp ccr ci- cia cib cic cii cip cir cpa cpb cpc cpi cpp cpr cra crb crc cri crp crr ia- iaa iab iac iai iap iar iba ibb ibc ibi ibp ibr ica icb icc ici icp icr iia iib iic iii iip iir ipa ipb ipc ipi ipp ipr ir- ira irb irc iri irp irr p-p paa pab pac pai pap par pba pbb pbc pbi pbp pbr pca pcb pcc pci pcp pcr pia pib pic pii pip pir ppa ppb ppc ppi ppp ppr pra prb prc pri prp prr ra- raa rab rac rai rap rar rba rbb rbc rbi rbp rbr rca rcb rcc rci rcp rcr ria rib ric rii rip rir rpa rpb rpc rpi rpp rpr rra rrb rrc rri rrp rrr