-er -ic a-a a-b a-c a-i aaa aab aac aad aae aag aai aar ab- aba abb abc abd abe abg abi abr ac- aca acb acc acd ace acg aci acr ad- ada adb adc add ade adg adi adr aea aeb aec aed aee aeg aei aer ag- aga agb agc agd age agg agi agr ai- aia aib aic aid aie aig aii air ar- ara arb arc ard are arg ari arr baa bab bac bad bae bag bai bar bba bbb bbc bbd bbe bbg bbi bbr bca bcb bcc bcd bce bcg bci bcr bda bdb bdc bdd bde bdg bdi bdr be- bea beb bec bed bee beg bei ber bga bgb bgc bgd bge bgg bgi bgr bi- bia bib bic bid bie big bii bir bra brb brd bre brg bri brr c-- caa cab cac cad cae cag cai car cba cbb cbc cbd cbe cbg cbi cbr cca ccb ccc ccd cce ccg cci ccr cda cdb cdc cdd cde cdg cdi cdr ce- cea ceb cec ced cee ceg cei cer cga cgb cgc cgd cge cgg cgi cgr ci- cia cib cic cid cie cig cii cir cra crb crc crd cre crg cri crr daa dab dac dad dae dag dai dar dba dbb dbc dbd dbe dbg dbi dbr dca dcb dcc dcd dce dcg dci dcr dda ddb ddc ddd dde ddg ddi ddr de- dea deb dec ded dee deg dei der dga dgc dgd dge dgg dgi dgr di- dia dib dic did die dig dii dir dra drb drc drd dre drg dri drr eaa eab eac ead eae eag eai ear eba ebb ebc ebd ebe ebg ebi ebr ec- eca ecb ecc ecd ece ecg eci ecr ed- eda edb edc edd ede edg edi edr eea eeb eec eed eee eeg eer ega egb egc egd ege egg egi egr eia eib eic eid eie eig eii eir era erb erc erd ere erg eri err g-d gaa gab gac gad gae gag gai gar gba gbc gbd gbe gbg gbi gbr gca gcb gcc gcd gce gcg gci gcr gda gdb gdc gdd gde gdi gdr ge- gea geb gec ged gee geg gei ger gga ggb ggc ggd ggg ggi ggr gia gib gic gid gie gig gii gir gra grb grc grd gre grg gri grr i-d ia- iaa iab iac iad iae iag iai iar iba ibb ibc ibd ibe ibg ibi ibr ica icb icc icd ice icg ici icr ida idb idc idd ide idg idi idr ie- iea iec ied iee ieg iei ier iga igb igc igd ige igg igi igr iia iib iic iid iie iii iir ir- ira irb irc ird ire irg iri irr ra- raa rab rac rad rae rag rai rar rba rbb rbc rbd rbe rbg rbi 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 rer rga rgb rgc rgd rge rgg rgi rgr ria rib ric rid rie rig rii rir rra rrb rrc rrd rrg rri rrr