-er -ic a-a a-b a-c a-i aaa aab aac aad aae aai aao aar ab- aba abb abc abd abe abi abo abr ac- aca acb acc acd ace aci aco acr ad- ada adb adc add ade adi ado adr aea aeb aec aed aee aei aeo aer ai- aia aib aic aid aie aii aio air aoa aob aoc aod aoe aoi aoo aor ar- ara arb arc ard are ari aro arr baa bab bac bad bae bai bao bar bba bbb bbc bbd bbe bbi bbo bbr bca bcb bcc bcd bce bci bco bcr bda bdb bdc bdd bde bdi bdo bdr be- bea beb bec bed bee bei beo ber bi- bia bib bic bid bie bii bio bir boa bob boc bod boe boi boo bor bra brb brd bre bri bro brr c-- caa cab cac cad cae cai cao car cba cbb cbc cbd cbe cbi cbo cbr cca ccb ccc ccd cce cci cco ccr cda cdb cdc cdd cde cdi cdo cdr ce- cea ceb cec ced cee cei ceo cer ci- cia cib cic cid cie cii cio cir co- coa cob coc cod coe coi coo cor cra crb crc crd cre cri cro crr daa dab dac dad dae dai dao dar dba dbb dbc dbd dbe dbi dbo dbr dca dcb dcc dcd dce dci dco dcr dda ddb ddc ddd dde ddi ddo ddr de- dea deb dec ded dee dei deo der di- dia dib dic did die dii dio dir doa dob doc dod doe doi doo dor dra drb drc drd dre dri dro drr eaa eab eac ead eae eai eao ear eba ebb ebc ebd ebe ebi ebo ebr ec- eca ecb ecc ecd ece eci eco ecr ed- eda edb edc edd ede edi edo edr eea eeb eec eed eee eeo eer eia eib eic eid eie eii eio eir eo- eoa eob eoc eod eoe eoi eoo eor era erb erc erd ere eri ero err i-d ia- iaa iab iac iad iae iai iao iar iba ibb ibc ibd ibe ibi ibo ibr ica icb icc icd ice ici ico icr ida idb idc idd ide idi ido idr ie- iea iec ied iee iei ier iia iib iic iid iie iii iio iir io- ioa iob ioc iod ioe ioi ioo ior ir- ira irb irc ird ire iri iro irr o-i oaa oab oac oad oae oai oao oar ob- oba obb obc obd obe obi obo obr oc- oca ocb occ ocd oci oco ocr oda odb odc odd ode odi odo odr oea oeb oec oed oee oei oeo oer oia oib oic oid oie oii oio oir oo- ooa oob ooc ood ooi ooo oor or- ora orb orc ord ore ori oro orr ra- raa rab rac rad rae rai rao rar rba rbb rbc rbd rbe rbi rbo rbr rca rcb rcc rcd rce rci rco rcr rda rdb rdc rdd rde rdi rdo rdr re- rea reb rec red ree rei reo rer ria rib ric rid rie rii rio rir roa rob roc rod roe roi roo ror rra rrb rrc rrd rri rrr