-er -ic a-a a-b a-c a-i aaa aab aac aad aae aai aak aar ab- aba abb abc abd abe abi abk abr ac- aca acb acc acd ace aci ack acr ad- ada adb adc add ade adi adk adr aea aeb aec aed aee aei aek aer ai- aia aib aic aid aie aii aik air aka akb akc akd ake aki akk akr ar- ara arb arc ard are ari ark arr baa bab bac bad bae bai bak bar bba bbb bbc bbd bbe bbi bbk bbr bca bcb bcc bcd bce bci bck bcr bda bdb bdc bdd bde bdi bdk bdr be- bea beb bec bed bee bei bek ber bi- bia bib bic bid bie bii bik bir bka bkb bkc bke bkk bkr bra brb brd bre bri brk brr c-- caa cab cac cad cae cai cak car cba cbb cbc cbd cbe cbi cbk cbr cca ccb ccc ccd cce cci cck ccr cda cdb cdc cdd cde cdi cdk cdr ce- cea ceb cec ced cee cei cek cer ci- cia cib cic cid cie cii cik cir cka ckb ckc ckd cki cra crb crc crd cre cri crk crr daa dab dac dad dae dai dak dar dba dbb dbc dbd dbe dbi dbk dbr dca dcb dcc dcd dce dci dck dcr dda ddb ddc ddd dde ddi ddk ddr de- dea deb dec ded dee dei dek der di- dia dib dic did die dii dik dir dka dkb dkc dke dki dkk dkr dra drb drc drd dre dri drk drr eaa eab eac ead eae eai eak ear eba ebb ebc ebd ebe ebi ebk ebr ec- eca ecb ecc ecd ece eci eck ecr ed- eda edb edc edd ede edi edk edr eea eeb eec eed eee eek eer eia eib eic eid eie eii eik eir eka ekb ekc ekd eke eki ekr era erb erc erd ere eri erk err i-d ia- iaa iab iac iad iae iai iar iba ibb ibc ibd ibe ibi ibk ibr ica icb icc icd ice ici ick icr ida idb idc idd ide idi idk idr ie- iea iec ied iee iei iek ier iia iib iic iid iie iii iir ika ikb ikc ike iki ikk ikr ir- ira irb irc ird ire iri irk irr ka- kaa kab kac kad kae kai kak kar kba kbb kbc kbd kbe kbi kbk kbr kca kcb kcc kcd kce kci kck kcr kda kdb kdc kde kdk kdr ke- kea keb kec ked kee kei kek ker kia kib kic kid kie kii kik kir kkb kkc kke kki kkk kkr kra krc krd kri krk krr ra- raa rab rac rad rae rai rak rar rba rbb rbc rbd rbe rbi rbk rbr rca rcb rcc rcd rce rci rcr rda rdb rdc rdd rde rdi rdr re- rea reb rec red ree rei rek rer ria rib ric rid rie rii rik rir rkb rkc rke rkk rra rrb rrc rrd rri rrk rrr