-er -ic a-a a-b a-c a-i aaa aab aac aad aae aai aar ab- aba abb abc abd abe abi abr ac- aca acb acc acd ace aci acr ad- ada adb adc add ade adi adr aea aeb aec aed aee aei aer ai- aia aib aic aid aie aii air ar- ara arb arc ard are ari arr baa bab bac bad bae bai bar bba bbb bbc bbd bbe bbi bbr bca bcb bcc bcd bce bci bcr bda bdb bdc bdd bde bdi bdr be- bea beb bec bed bee bei ber bi- bia bib bic bid bie bii bir bra brb brd bre bri brr c-- caa cab cac cad cae cai car cba cbb cbc cbd cbe cbi cbr cca ccb ccc ccd cce cci ccr cda cdb cdc cdd cde cdi cdr ce- cea ceb cec ced cee cei cer ci- cia cib cic cid cie cii cir cra crb crc crd cre cri crr daa dab dac dad dae dai dar dba dbb dbc dbd dbe dbi dbr dca dcb dcc dcd dce dci dcr dda ddb ddc ddd dde ddi ddr de- dea deb dec ded dee dei der di- dia dib dic did die dii dir dra drb drc drd dre dri drr eaa eab eac ead eae eai ear eba ebb ebc ebd ebe ebi ebr ec- eca ecb ecc ecd ece eci ecr ed- eda edb edc edd ede edi edr eea eeb eec eed eee eer eia eib eic eid eie eii eir era erb erc erd ere eri err i-d ia- iaa iab iac iad iae iai iar iba ibb ibc ibd ibe ibi ibr ica icb icc icd ice ici icr ida idb idc idd ide idi idr ie- iea iec ied iee iei ier iia iib iic iid iie iii iir ir- ira irb irc ird ire iri irr ra- raa rab rac rad rae rai rar rba rbb rbc rbd rbe rbi rbr rca rcb rcc rcd rce rci rcr rda rdb rdc rdd rde rdi rdr re- rea reb rec red ree rei rer ria rib ric rid rie rii rir rra rrb rrc rrd rri rrr