-ic a-a a-b a-c a-i aaa aab aac aai aam aap aar ab- aba abb abc abi abm abp abr ac- aca acb acc aci acm acp acr ai- aia aib aic aii aim aip air ama amb amc ami amm amp amr ap- apa apb apc api apm app apr ar- ara arb arc ari arm arp arr b-p baa bab bac bai bam bap bar bba bbb bbc bbi bbm bbp bbr bca bcb bcc bci bcm bcp bcr bi- bia bib bic bii bim bip bir bma bmb bmc bmi bmm bmp bmr bpa bpb bpc bpi bpm bpp bpr bra brb bri brm brp brr c-- caa cab cac cai cam cap car cba cbb cbc cbi cbm cbp cbr cca ccb ccc cci ccm ccp ccr ci- cia cib cic cii cim cip cir cma cmb cmc cmi cmm cmp cmr cpa cpb cpc cpi cpm cpp cpr cra crb crc cri crm crp crr ia- iaa iab iac iai iam iap iar iba ibb ibc ibi ibm ibp ibr ica icb icc ici icm icp icr iia iib iic iii iim iip iir im- ima imb imc imi imm imp ipa ipb ipc ipi ipm ipp ipr ir- ira irb irc iri irm irp irr m-r maa mab mac mai mam map mar mba mbb mbc mbi mbm mbp mbr mc- mca mcb mcc mci mcm mcp mcr mi- mia mib mic mii mim mip mir mma mmb mmc mmi mmm mmp mmr mpa mpb mpc mpi mpm mpp mpr mra mrb mrc mri mrm mrp mrr p-p paa pab pac pai pam pap par pba pbb pbc pbi pbm pbp pbr pca pcb pcc pci pcm pcp pcr pia pib pic pii pim pip pir pma pmb pmc pmi pmm pmp pmr ppa ppb ppc ppi ppm ppp ppr pra prb prc pri prm prp prr ra- raa rab rac rai ram rap rar rba rbb rbc rbi rbm rbp rbr rca rcb rcc rci rcm rcp rcr ria rib ric rii rim rip rir rma rmb rmc rmi rmm rmp rmr rpa rpb rpc rpi rpm rpp rpr rra rrb rrc rri rrm rrp rrr