-ic a-a a-b a-c a-i aaa aab aac aad aai aao aap aar ab- aba abb abc abd abi abo abp abr ac- aca acb acc acd aci aco acp acr ad- ada adb adc add adi ado adp adr ai- aia aib aic aid aii aio aip air aoa aob aoc aod aoi aoo aop aor ap- apa apb apc apd api apo app apr ar- ara arb arc ard ari aro arp arr b-p baa bab bac bad bai bao bap bar bba bbb bbc bbd bbi bbo bbp bbr bca bcb bcc bcd bci bco bcp bcr bda bdb bdc bdd bdi bdo bdp bdr bi- bia bib bic bid bii bio bip bir boa bob boc bod boi boo bop bor bpa bpb bpc bpd bpi bpo bpp bpr bra brb brd bri bro brp brr c-- caa cab cac cad cai cao cap car cba cbb cbc cbd cbi cbo cbp cbr cca ccb ccc ccd cci cco ccp ccr cda cdb cdc cdd cdi cdo cdp cdr ci- cia cib cic cid cii cio cip cir co- coa cob coc cod coi coo cop cor cpa cpb cpc cpd cpi cpo cpp cpr cra crb crc crd cri cro crp crr daa dab dac dad dai dao dap dar dba dbb dbc dbd dbi dbo dbp dbr dca dcb dcc dcd dci dco dcp dcr dda ddb ddc ddd ddi ddo ddp ddr di- dia dib dic did dii dio dip dir doa dob doc dod doi doo dop dor dpa dpb dpc dpd dpi dpo dpp dpr dra drb drc drd dri dro drp drr i-d ia- iaa iab iac iad iai iao iap iar iba ibb ibc ibd ibi ibo ibp ibr ica icb icc icd ici ico icp icr ida idb idc idd idi ido idp idr iia iib iic iid iii iio iip iir io- ioa iob ioc iod ioi ioo iop ior ipa ipb ipc ipd ipi ipo ipp ipr ir- ira irb irc ird iri iro irp irr o-i oaa oab oac oad oai oao oap oar ob- oba obb obc obd obi obo obp obr oc- oca ocb occ ocd oci oco ocp ocr oda odb odc odd odi odo odp odr oia oib oic oid oii oio oip oir oo- ooa oob ooc ood ooi ooo oop oor op- opa opb opc opd opi opo opp opr or- ora orb orc ord ori oro orp orr p-p paa pab pac pad pai pao pap par pba pbb pbc pbd pbi pbo pbp pbr pca pcb pcc pcd pci pco pcp pcr pda pdb pdc pdd pdi pdo pdp pdr pia pib pic pid pii pio pip pir poa pob poc pod poi poo pop por ppa ppb ppc ppd ppi ppo ppp ppr pra prb prc prd pri pro prp prr ra- raa rab rac rad rai rao rap rar rba rbb rbc rbd rbi rbo rbp rbr rca rcb rcc rcd rci rco rcp rcr rda rdb rdc rdd rdi rdo rdp rdr ria rib ric rid rii rio rip rir roa rob roc rod roi roo rop ror rpa rpb rpc rpd rpi rpo rpp rpr rra rrb rrc rrd rri rrp rrr