-er a-a a-b a-c aaa aab aac aad aae aag aah aar ab- aba abb abc abd abe abg abh abr ac- aca acb acc acd ace acg ach acr ad- ada adb adc add ade adg adh adr aea aeb aec aed aee aeg aeh aer ag- aga agb agc agd age agg agh agr aha ahb ahc ahd ahe ahg ahh ahr ar- ara arb arc ard are arg arh arr baa bab bac bad bae bag bah bar bba bbb bbc bbd bbe bbg bbh bbr bca bcb bcc bcd bce bcg bch bcr bda bdb bdc bdd bde bdg bdh bdr be- bea beb bec bed bee beg beh ber bga bgb bgc bgd bge bgg bgh bgr bha bhb bhc bhd bhe bhg bhh bhr bra brb brd bre brg brh brr c-- caa cab cac cad cae cag cah car cba cbb cbc cbd cbe cbg cbh cbr cca ccb ccc ccd cce ccg cch ccr cda cdb cdc cdd cde cdg cdh cdr ce- cea ceb cec ced cee ceg ceh cer cga cgb cgc cgd cge cgg cgh cgr ch- cha chb chc chd che chg chh chr cra crb crc crd cre crg crh crr daa dab dac dad dae dag dah dar dba dbb dbc dbd dbe dbg dbh dbr dca dcb dcc dcd dce dcg dcr dda ddb ddc ddd dde ddg ddh ddr de- dea deb dec ded dee deg deh der dga dgc dgd dge dgg dgh dgr dh- dha dhb dhc dhd dhe dhh dhr dra drb drc drd dre drg drr eaa eab eac ead eae eag eah ear eba ebb ebc ebd ebe ebg ebh ebr ec- eca ecb ecc ecd ece ecg ech ecr ed- eda edb edc edd ede edg edh edr eea eeb eec eed eee eeg eer ega egb egc egd ege egg egh egr eha ehb ehc ehd ehe ehg ehh ehr era erb erc erd ere erg erh err g-d gaa gab gac gad gae gag gah gar gba gbc gbd gbe gbg gbh gbr gca gcb gcc gcd gce gcg gch gcr gda gdb gdc gdd gde gdh gdr ge- gea geb gec ged gee geg geh ger gga ggb ggc ggd ggg ggh ggr gha ghb ghc ghd ghe ghg ghh ghr gra grb grc grd gre grg grh grr haa hab hac had hae hag hah har hba hbb hbc hbd hbe hbg hbh hbr hca hcb hcc hcd hce hcg hch hcr hda hdb hdc hdd hde hdg hdh hdr he- hea heb hec hed hee heg heh her hga hgb hgc hge hgg hgh hgr hha hhb hhc hhd hhe hhg hhh hhr hr- hra hrb hrc hrd hre hrg hrh hrr ra- raa rab rac rad rae rag rah rar rba rbb rbc rbd rbe rbg rbh rbr rca rcb rcc rcd rce rcg rch rcr rda rdb rdc rdd rde rdg rdh rdr re- rea reb rec red ree reg reh rer rga rgb rgc rgd rge rgg rgh rgr rh- rha rhb rhc rhd rhe rhg rhh rhr rra rrb rrc rrd rrg rrh rrr