-er -ic a-a a-b a-c a-i a-t aaa aab aac aad aae aai aar aat ab- aba abb abc abd abe abi abr abt ac- aca acb acc acd ace aci acr act ad- ada adb adc add ade adi adr adt aea aeb aec aed aee aei aer aet ai- aia aib aic aid aie aii air ait ar- ara arb arc ard are ari arr art at- ata atb atc atd ate ati atr att baa bab bac bad bae bai bar bat bba bbb bbc bbd bbe bbi bbr bbt bca bcb bcc bcd bce bci bcr bct bda bdb bdc bdd bde bdi bdr bdt be- bea beb bec bed bee bei ber bet bi- bia bib bic bid bie bii bir bit bra brb brd bre bri brr brt bta btb btc btd bte bti btr btt c-- caa cab cac cad cae cai car cat cba cbb cbc cbd cbe cbi cbr cbt cca ccb ccc ccd cce cci ccr cct cda cdb cdc cdd cde cdi cdr cdt ce- cea ceb cec ced cee cei cer cet ci- cia cib cic cid cie cii cir cit cra crb crc crd cre cri crr crt cta ctb ctc ctd cte cti ctr ctt daa dab dac dad dae dai dar dat dba dbb dbc dbd dbe dbi dbr dbt dca dcb dcc dcd dce dci dcr dct dda ddb ddc ddd dde ddi ddr ddt de- dea deb dec ded dee dei der det di- dia dib dic did die dii dir dit dra drb drc drd dre dri drr drt dta dtb dtc dtd dte dti dtr dtt eaa eab eac ead eae eai ear eat eba ebb ebc ebd ebe ebi ebr ebt ec- eca ecb ecc ecd ece eci ecr ect ed- eda edb edc edd ede edi edr edt eea eeb eec eed eee eer eet eia eib eic eid eie eii eir eit era erb erc erd ere eri err ert eta etb etc etd ete eti etr ett i-d ia- iaa iab iac iad iae iai iar iat iba ibb ibc ibd ibe ibi ibr ibt ica icb icc icd ice ici icr ict ida idb idc idd ide idi idr idt ie- iea iec ied iee iei ier iet iia iib iic iid iie iii iir iit ir- ira irb irc ird ire iri irr irt ita itb itc itd ite iti itt ra- raa rab rac rad rae rai rar rat rba rbb rbc rbd rbe rbi rbr rbt rca rcb rcc rcd rce rci rcr rct rda rdb rdc rdd rde rdi rdr rdt re- rea reb rec red ree rei rer ret ria rib ric rid rie rii rir rit rra rrb rrc rrd rri rrr rrt rta rtb rtc rtd rte rti rtr rtt taa tab tac tad tae tai tar tat tba tbb tbc tbd tbe tbi tbr tbt tca tcb tcc tcd tce tci tcr tct tda tdb tdc tdd tde tdi tdr tdt te- tea teb tec ted tee tei ter tet tia tib tic tid tie tii tir tit tra trb trc trd tre tri trr trt tta ttb ttc ttd tte tti ttr ttt