-er -ic a-a a-b a-c a-i a-t aaa aab aac aad aae aai aao aar aat ab- aba abb abc abd abe abi abo abr abt ac- aca acb acc acd ace aci aco acr act ad- ada adb adc add ade adi ado adr adt aea aeb aec aed aee aei aeo aer aet ai- aia aib aic aid aie aii aio air ait aoa aob aoc aod aoe aoi aoo aor aot ar- ara arb arc ard are ari aro arr art at- ata atb atc atd ate ati ato atr att baa bab bac bad bae bai bao bar bat bba bbb bbc bbd bbe bbi bbo bbr bbt bca bcb bcc bcd bce bci bco bcr bct bda bdb bdc bdd bde bdi bdo bdr bdt be- bea beb bec bed bee bei beo ber bet bi- bia bib bic bid bie bii bio bir bit boa bob boc bod boe boi boo bor bot bra brb brd bre bri bro brr brt bta btb btc btd bte bti bto btr btt c-- caa cab cac cad cae cai cao car cat cba cbb cbc cbd cbe cbi cbo cbr cbt cca ccb ccc ccd cce cci cco ccr cct cda cdb cdc cdd cde cdi cdo cdr cdt ce- cea ceb cec ced cee cei ceo cer cet ci- cia cib cic cid cie cii cio cir cit co- coa cob coc cod coe coi coo cor cot cra crb crc crd cre cri cro crr crt cta ctb ctc ctd cte cti cto ctr ctt daa dab dac dad dae dai dao dar dat dba dbb dbc dbd dbe dbi dbo dbr dbt dca dcb dcc dcd dce dci dco dcr dct dda ddb ddc ddd dde ddi ddo ddr ddt de- dea deb dec ded dee dei deo der det di- dia dib dic did die dii dio dir dit doa dob doc dod doe doi doo dor dot dra drb drc drd dre dri dro drr drt dta dtb dtc dtd dte dti dto dtr dtt eaa eab eac ead eae eai eao ear eat eba ebb ebc ebd ebe ebi ebo ebr ebt ec- eca ecb ecc ecd ece eci eco ecr ect ed- eda edb edc edd ede edi edo edr edt eea eeb eec eed eee eeo eer eet eia eib eic eid eie eii eio eir eit eo- eoa eob eoc eod eoe eoi eoo eor eot era erb erc erd ere eri ero err ert eta etb etc etd ete eti eto etr ett i-d ia- iaa iab iac iad iae iai iao iar iat iba ibb ibc ibd ibe ibi ibo ibr ibt ica icb icc icd ice ici ico icr ict ida idb idc idd ide idi ido idr idt ie- iea iec ied iee iei ier iet iia iib iic iid iie iii iio iir iit io- ioa iob ioc iod ioe ioi ioo ior iot ir- ira irb irc ird ire iri iro irr irt ita itb itc itd ite iti ito itt o-i oaa oab oac oad oae oai oao oar oat ob- oba obb obc obd obe obi obo obr obt oc- oca ocb occ ocd oci oco ocr oct oda odb odc odd ode odi odo odr odt oea oeb oec oed oee oei oeo oer oet oia oib oic oid oie oii oio oir oit oo- ooa oob ooc ood ooi ooo oor oot or- ora orb orc ord ore ori oro orr ort ot- ota otb otc otd ote oti oto otr ott ra- raa rab rac rad rae rai rao rar rat rba rbb rbc rbd rbe rbi rbo rbr rbt rca rcb rcc rcd rce rci rco rcr rct rda rdb rdc rdd rde rdi rdo rdr rdt re- rea reb rec red ree rei reo rer ret ria rib ric rid rie rii rio rir rit roa rob roc rod roe roi roo ror rot rra rrb rrc rrd rri rrr rrt rta rtb rtc rtd rte rti rto rtr rtt taa tab tac tad tae tai tao tar tat tba tbb tbc tbd tbe tbi tbo tbr tbt tca tcb tcc tcd tce tci tco tcr tct tda tdb tdc tdd tde tdi tdo tdr tdt te- tea teb tec ted tee tei teo ter tet tia tib tic tid tie tii tio tir tit to- toa tob toc tod toe toi too tor tot tra trb trc trd tre tri tro trr trt tta ttb ttc ttd tte tti tto ttr ttt