-er -ic a-a a-b a-c a-i aaa aab aac aad aae aai aao aap aar ab- aba abb abc abd abe abi abo abp abr ac- aca acb acc acd ace aci aco acp acr ad- ada adb adc add ade adi ado adp adr aea aeb aec aed aee aei aeo aep aer ai- aia aib aic aid aie aii aio aip air aoa aob aoc aod aoe aoi aoo aop aor ap- apa apb apc apd ape api apo app apr ar- ara arb arc ard are ari aro arp arr b-p baa bab bac bad bae bai bao bap bar bba bbb bbc bbd bbe bbi bbo bbp bbr bca bcb bcc bcd bce bci bco bcp bcr bda bdb bdc bdd bde bdi bdo bdp bdr be- bea beb bec bed bee bei beo bep ber bi- bia bib bic bid bie bii bio bip bir boa bob boc bod boe boi boo bop bor bpa bpb bpc bpd bpe bpi bpo bpp bpr bra brb brd bre bri bro brp brr c-- caa cab cac cad cae cai cao cap car cba cbb cbc cbd cbe cbi cbo cbp cbr cca ccb ccc ccd cce cci cco ccp ccr cda cdb cdc cdd cde cdi cdo cdp cdr ce- cea ceb cec ced cee cei ceo cep cer ci- cia cib cic cid cie cii cio cip cir co- coa cob coc cod coe coi coo cop cor cpa cpb cpc cpd cpe cpi cpo cpp cpr cra crb crc crd cre cri cro crp crr daa dab dac dad dae dai dao dap dar dba dbb dbc dbd dbe dbi dbo dbp dbr dca dcb dcc dcd dce dci dco dcp dcr dda ddb ddc ddd dde ddi ddo ddp ddr de- dea deb dec ded dee dei deo dep der di- dia dib dic did die dii dio dip dir doa dob doc dod doe doi doo dop dor dpa dpb dpc dpd dpe dpi dpo dpp dpr dra drb drc drd dre dri dro drp drr eaa eab eac ead eae eai eao eap ear eba ebb ebc ebd ebe ebi ebo ebp ebr ec- eca ecb ecc ecd ece eci eco ecr ed- eda edb edc edd ede edi edo edp edr eea eeb eec eed eee eeo eep eer eia eib eic eid eie eii eio eip eir eo- eoa eob eoc eod eoe eoi eoo eop eor ep- epa epb epc epd epe epi epo epp epr era erb erc erd ere eri ero erp err i-d ia- iaa iab iac iad iae iai iao iap iar iba ibb ibc ibd ibe ibi ibo ibp ibr ica icb icc icd ice ici ico icp icr ida idb idc idd ide idi ido idp idr ie- iea iec ied iee iei iep ier iia iib iic iid iie iii iio iip iir io- ioa iob ioc iod ioe ioi ioo iop ior ipa ipb ipc ipd ipe ipi ipo ipp ipr ir- ira irb irc ird ire iri iro irp irr o-i oaa oab oac oad oae oai oao oap oar ob- oba obb obc obd obe obi obo obp obr oc- oca ocb occ ocd oci oco ocp ocr oda odb odc odd ode odi odo odp odr oea oeb oec oed oee oei oeo oep oer oia oib oic oid oie oii oio oip oir oo- ooa oob ooc ood ooi ooo oop oor op- opa opb opc opd ope opi opo opp opr or- ora orb orc ord ore ori oro orp orr p-p paa pab pac pad pae pai pao pap par pba pbb pbc pbd pbe pbi pbo pbp pbr pca pcb pcc pcd pce pci pco pcp pcr pda pdb pdc pdd pde pdi pdo pdp pdr pea peb pec ped pee pei peo pep per pia pib pic pid pie pii pio pip pir poa pob poc pod poe poi poo pop por ppa ppb ppc ppd ppe ppi ppo ppp ppr pra prb prc prd pre pri pro prp prr ra- raa rab rac rad rae rai rao rap rar rba rbb rbc rbd rbe rbi rbo rbp rbr rca rcb rcc rcd rce rci rco rcp rcr rda rdb rdc rdd rde rdi rdo rdp rdr re- rea reb rec red ree rei reo rep rer ria rib ric rid rie rii rio rip rir roa rob roc rod roe roi roo rop ror rpa rpb rpc rpd rpe rpi rpo rpp rpr rra rrb rrc rrd rri rrp rrr