-er a-a a-b a-c aaa aab aac aad aae aag aar ab- aba abb abc abd abe abg abr ac- aca acb acc acd ace acg acr ad- ada adb adc add ade adg adr aea aeb aec aed aee aeg aer ag- aga agb agc agd age agg agr ar- ara arb arc ard are arg arr baa bab bac bad bae bag bar bba bbb bbc bbd bbe bbg bbr bca bcb bcc bcd bce bcg bcr bda bdb bdc bdd bde bdg bdr be- bea beb bec bed bee beg ber bga bgb bgc bgd bge bgg bgr bra brb brd bre brg brr c-- caa cab cac cad cae cag car cba cbb cbc cbd cbe cbg cbr cca ccb ccc ccd cce ccg ccr cda cdb cdc cdd cde cdg cdr ce- cea ceb cec ced cee ceg cer cga cgb cgc cgd cge cgg cgr cra crb crc crd cre crg crr daa dab dac dad dae dag dar dba dbb dbc dbd dbe dbg dbr dca dcb dcc dcd dce dcg dcr dda ddb ddc ddd dde ddg ddr de- dea deb dec ded dee deg der dga dgc dgd dge dgg dgr dra drb drc drd dre drg drr eaa eab eac ead eae eag ear eba ebb ebc ebd ebe ebg ebr ec- eca ecb ecc ecd ece ecg ecr ed- eda edb edc edd ede edg edr eea eeb eec eed eee eeg eer ega egb egc egd ege egg egr era erb erc erd ere erg err g-d gaa gab gac gad gae gag gar gba gbc gbd gbe gbg gbr gca gcb gcc gcd gce gcg gcr gda gdb gdc gdd gde gdr ge- gea geb gec ged gee geg ger gga ggb ggc ggd ggg ggr gra grb grc grd gre grg grr ra- raa rab rac rad rae rag rar rba rbb rbc rbd rbe rbg rbr rca rcb rcc rcd rce rcg rcr rda rdb rdc rdd rde rdg rdr re- rea reb rec red ree reg rer rga rgb rgc rgd rge rgg rgr rra rrb rrc rrd rrg rrr