-ic a-a a-b a-c a-i aaa aab aac aad aai aak aao aap aar ab- aba abb abc abd abi abk abo abp abr ac- aca acb acc acd aci ack aco acp acr ad- ada adb adc add adi adk ado adp adr ai- aia aib aic aid aii aik aio aip air aka akb akc akd aki akk ako akp akr aoa aob aoc aod aoi aok aoo aop aor ap- apa apb apc apd api apk apo app apr ar- ara arb arc ard ari ark aro arp arr b-p baa bab bac bad bai bak bao bap bar bba bbb bbc bbd bbi bbk bbo bbp bbr bca bcb bcc bcd bci bck bco bcp bcr bda bdb bdc bdd bdi bdk bdo bdp bdr bi- bia bib bic bid bii bik bio bip bir bka bkb bkc bkk bko bkp bkr boa bob boc bod boi bok boo bop bor bpa bpb bpc bpd bpi bpo bpp bpr bra brb brd bri brk bro brp brr c-- caa cab cac cad cai cak cao cap car cba cbb cbc cbd cbi cbk cbo cbp cbr cca ccb ccc ccd cci cck cco ccp ccr cda cdb cdc cdd cdi cdk cdo cdp cdr ci- cia cib cic cid cii cik cio cip cir cka ckb ckc ckd cki cko co- coa cob coc cod coi cok coo cop cor cpa cpb cpc cpd cpi cpk cpo cpp cpr cra crb crc crd cri crk cro crp crr daa dab dac dad dai dak dao dap dar dba dbb dbc dbd dbi dbk dbo dbp dbr dca dcb dcc dcd dci dck dco dcp dcr dda ddb ddc ddd ddi ddk ddo ddp ddr di- dia dib dic did dii dik dio dip dir dka dkb dkc dki dkk dko dkp dkr doa dob doc dod doi dok doo dop dor dpa dpb dpc dpd dpi dpk dpo dpp dpr dra drb drc drd dri drk dro drp drr i-d ia- iaa iab iac iad iai iao iap iar iba ibb ibc ibd ibi ibk ibo ibp ibr ica icb icc icd ici ick ico icp icr ida idb idc idd idi idk ido idp idr iia iib iic iid iii iio iip iir ika ikb ikc iki ikk iko ikr io- ioa iob ioc iod ioi ioo iop ior ipa ipb ipc ipd ipi ipo ipp ipr ir- ira irb irc ird iri irk iro irp irr ka- kaa kab kac kad kai kak kao kap kar kba kbb kbc kbd kbi kbk kbo kbp kbr kca kcb kcc kcd kci kck kcp kcr kda kdb kdc kdk kdo kdp kdr kia kib kic kid kii kik kio kip kir kkb kkc kki kkk kkp kkr koa kob koc kod koi kok koo kop kor kpa kpc kpd kpi kpk kpo kpp kpr kra krc krd kri krk kro krp krr o-i oaa oab oac oad oai oak oao oap oar ob- oba obb obc obd obi obk obo obp obr oc- oca ocb occ ocd oci ock oco ocp ocr oda odb odc odd odi odo odp odr oia oib oic oid oii oik oio oip oir oka okb okc okd oki okk oko okp okr oo- ooa oob ooc ood ooi ook ooo oop oor op- opa opb opc opd opi opk opo opp opr or- ora orb orc ord ori ork oro orp orr p-p paa pab pac pad pai pak pao pap par pba pbb pbc pbd pbi pbk pbo pbp pbr pca pcb pcc pcd pci pck pco pcp pcr pda pdb pdc pdd pdi pdk pdo pdp pdr pia pib pic pid pii pik pio pip pir pka pkb pkc pkd pki pko pkp pkr poa pob poc pod poi pok poo pop por ppa ppb ppc ppd ppi ppk ppo ppp ppr pra prb prc prd pri prk pro prp prr ra- raa rab rac rad rai rak rao rap rar rba rbb rbc rbd rbi rbk rbo rbp rbr rca rcb rcc rcd rci rco rcp rcr rda rdb rdc rdd rdi rdo rdp rdr ria rib ric rid rii rik rio rip rir rkb rkc rkk rko rkp roa rob roc rod roi rok roo rop ror rpa rpb rpc rpd rpi rpk rpo rpp rpr rra rrb rrc rrd rri rrk rrp rrr