-ic a-a a-b a-c a-i aaa aab aac aai aao aap aar ab- aba abb abc abi abo abp abr ac- aca acb acc aci aco acp acr ai- aia aib aic aii aio aip air aoa aob aoc aoi aoo aop aor ap- apa apb apc api apo app apr ar- ara arb arc ari aro arp arr b-p baa bab bac bai bao bap bar bba bbb bbc bbi bbo bbp bbr bca bcb bcc bci bco bcp bcr bi- bia bib bic bii bio bip bir boa bob boc boi boo bop bor bpa bpb bpc bpi bpo bpp bpr bra brb bri bro brp brr c-- caa cab cac cai cao cap car cba cbb cbc cbi cbo cbp cbr cca ccb ccc cci cco ccp ccr ci- cia cib cic cii cio cip cir co- coa cob coc coi coo cop cor cpa cpb cpc cpi cpo cpp cpr cra crb crc cri cro crp crr ia- iaa iab iac iai iao iap iar iba ibb ibc ibi ibo ibp ibr ica icb icc ici ico icp icr iia iib iic iii iio iip iir io- ioa iob ioc ioi ioo iop ior ipa ipb ipc ipi ipo ipp ipr ir- ira irb irc iri iro irp irr o-i oaa oab oac oai oao oap oar ob- oba obb obc obi obo obp obr oc- oca ocb occ oci oco ocp ocr oia oib oic oii oio oip oir oo- ooa oob ooc ooi ooo oop oor op- opa opb opc opi opo opp opr or- ora orb orc ori oro orp orr p-p paa pab pac pai pao pap par pba pbb pbc pbi pbo pbp pbr pca pcb pcc pci pco pcp pcr pia pib pic pii pio pip pir poa pob poc poi poo pop por ppa ppb ppc ppi ppo ppp ppr pra prb prc pri pro prp prr ra- raa rab rac rai rao rap rar rba rbb rbc rbi rbo rbp rbr rca rcb rcc rci rco rcp rcr ria rib ric rii rio rip rir roa rob roc roi roo rop ror rpa rpb rpc rpi rpo rpp rpr rra rrb rrc rri rrp rrr