-er -ic a-a a-b a-c a-i aaa aab aac aad aae aag aai aak aar ab- aba abb abc abd abe abg abi abk abr ac- aca acb acc acd ace acg aci ack acr ad- ada adb adc add ade adg adi adk adr aea aeb aec aed aee aeg aei aek aer ag- aga agb agc agd age agg agi agk agr ai- aia aib aic aid aie aig aii aik air aka akb akc akd ake akg aki akk akr ar- ara arb arc ard are arg ari ark arr baa bab bac bad bae bag bai bak bar bba bbb bbc bbd bbe bbg bbi bbk bbr bca bcb bcc bcd bce bcg bci bck bcr bda bdb bdc bdd bde bdg bdi bdk bdr be- bea beb bec bed bee beg bei bek ber bga bgb bgc bgd bge bgg bgi bgk bgr bi- bia bib bic bid bie big bii bik bir bka bkb bkc bke bkg bkk bkr bra brb brd bre brg bri brk brr c-- caa cab cac cad cae cag cai cak car cba cbb cbc cbd cbe cbg cbi cbk cbr cca ccb ccc ccd cce ccg cci cck ccr cda cdb cdc cdd cde cdg cdi cdk cdr ce- cea ceb cec ced cee ceg cei cek cer cga cgb cgc cgd cge cgg cgi cgr ci- cia cib cic cid cie cig cii cik cir cka ckb ckc ckd cki cra crb crc crd cre crg cri crk crr daa dab dac dad dae dag dai dak dar dba dbb dbc dbd dbe dbg dbi dbk dbr dca dcb dcc dcd dce dcg dci dck dcr dda ddb ddc ddd dde ddg ddi ddk ddr de- dea deb dec ded dee deg dei dek der dga dgc dgd dge dgg dgi dgk dgr di- dia dib dic did die dig dii dik dir dka dkb dkc dke dkg dki dkk dkr dra drb drc drd dre drg dri drk drr eaa eab eac ead eae eag eai eak ear eba ebb ebc ebd ebe ebg ebi ebk ebr ec- eca ecb ecc ecd ece ecg eci eck ecr ed- eda edb edc edd ede edg edi edk edr eea eeb eec eed eee eeg eek eer ega egb egc egd ege egg egi egr eia eib eic eid eie eig eii eik eir eka ekb ekc ekd eke ekg eki ekr era erb erc erd ere erg eri erk err g-d gaa gab gac gad gae gag gai gak gar gba gbc gbd gbe gbg gbi gbk gbr gca gcb gcc gcd gce gcg gci gck gcr gda gdb gdc gdd gde gdi gdk gdr ge- gea geb gec ged gee geg gei gek ger gga ggb ggc ggd ggg ggi ggr gia gib gic gid gie gig gii gik gir gka gkb gkd gra grb grc grd gre grg gri grk grr i-d ia- iaa iab iac iad iae iag iai iar iba ibb ibc ibd ibe ibg ibi ibk ibr ica icb icc icd ice icg ici ick icr ida idb idc idd ide idg idi idk idr ie- iea iec ied iee ieg iei iek ier iga igb igc igd ige igg igi igk igr iia iib iic iid iie iii iir ika ikb ikc ike iki ikk ikr ir- ira irb irc ird ire irg iri irk irr ka- kaa kab kac kad kae kag kai kak kar kba kbb kbc kbd kbe kbi kbk kbr kca kcb kcc kcd kce kcg kci kck kcr kda kdb kdc kde kdg kdk kdr ke- kea keb kec ked kee keg kei kek ker kga kgb kgc kgd kgi kia kib kic kid kie kig kii kik kir kkb kkc kke kki kkk kkr kra krc krd krg kri krk krr ra- raa rab rac rad rae rag rai rak rar rba rbb rbc rbd rbe rbg rbi rbk rbr rca rcb rcc rcd rce rcg rci rcr rda rdb rdc rdd rde rdg rdi rdr re- rea reb rec red ree reg rei rek rer rga rgb rgc rgd rge rgg rgi rgk rgr ria rib ric rid rie rig rii rik rir rkb rkc rke rkg rkk rra rrb rrc rrd rrg rri rrk rrr