-er a-a a-b a-c aaa aab aac aad aae aag aah aak aar ab- aba abb abc abd abe abg abh abk abr ac- aca acb acc acd ace acg ach ack acr ad- ada adb adc add ade adg adh adk adr aea aeb aec aed aee aeg aeh aek aer ag- aga agb agc agd age agg agh agk agr aha ahb ahc ahd ahe ahg ahh ahk ahr aka akb akc akd ake akg akh akk akr ar- ara arb arc ard are arg arh ark arr baa bab bac bad bae bag bah bak bar bba bbb bbc bbd bbe bbg bbh bbk bbr bca bcb bcc bcd bce bcg bch bck bcr bda bdb bdc bdd bde bdg bdh bdk bdr be- bea beb bec bed bee beg beh bek ber bga bgb bgc bgd bge bgg bgh bgk bgr bha bhb bhc bhd bhe bhg bhh bhk bhr bka bkb bkc bke bkg bkk bkr bra brb brd bre brg brh brk brr c-- caa cab cac cad cae cag cah cak car cba cbb cbc cbd cbe cbg cbh cbk cbr cca ccb ccc ccd cce ccg cch cck ccr cda cdb cdc cdd cde cdg cdh cdk cdr ce- cea ceb cec ced cee ceg ceh cek cer cga cgb cgc cgd cge cgg cgh cgr ch- cha chb chc chd che chg chh chk chr cka ckb ckc ckd ckh cra crb crc crd cre crg crh crk crr daa dab dac dad dae dag dah dak dar dba dbb dbc dbd dbe dbg dbh dbk dbr dca dcb dcc dcd dce dcg dck dcr dda ddb ddc ddd dde ddg ddh ddk ddr de- dea deb dec ded dee deg deh dek der dga dgc dgd dge dgg dgh dgk dgr dh- dha dhb dhc dhd dhe dhh dhk dhr dka dkb dkc dke dkg dkk dkr dra drb drc drd dre drg drk drr eaa eab eac ead eae eag eah eak ear eba ebb ebc ebd ebe ebg ebh ebk ebr ec- eca ecb ecc ecd ece ecg ech eck ecr ed- eda edb edc edd ede edg edh edk edr eea eeb eec eed eee eeg eek eer ega egb egc egd ege egg egh egr eha ehb ehc ehd ehe ehg ehh ehr eka ekb ekc ekd eke ekg ekh ekr era erb erc erd ere erg erh erk err g-d gaa gab gac gad gae gag gah gak gar gba gbc gbd gbe gbg gbh gbk gbr gca gcb gcc gcd gce gcg gch gck gcr gda gdb gdc gdd gde gdh gdk gdr ge- gea geb gec ged gee geg geh gek ger gga ggb ggc ggd ggg ggh ggr gha ghb ghc ghd ghe ghg ghh ghr gka gkb gkd gkh gra grb grc grd gre grg grh grk grr haa hab hac had hae hag hah hak har hba hbb hbc hbd hbe hbg hbh hbk hbr hca hcb hcc hcd hce hcg hch hck hcr hda hdb hdc hdd hde hdg hdh hdk hdr he- hea heb hec hed hee heg heh hek her hga hgb hgc hge hgg hgh hgk hgr hha hhb hhc hhd hhe hhg hhh hhk hhr hka hkb hkd hkg hkh hkk hkr hr- hra hrb hrc hrd hre hrg hrh hrk hrr ka- kaa kab kac kad kae kag kah kak kar kba kbb kbc kbd kbe kbh kbk kbr kca kcb kcc kcd kce kcg kch kck kcr kda kdb kdc kde kdg kdh kdk kdr ke- kea keb kec ked kee keg keh kek ker kga kgb kgc kgd kgh kha khe khh khk khr kkb kkc kke kkh kkk kkr kra krc krd krg krk krr ra- raa rab rac rad rae rag rah rak rar rba rbb rbc rbd rbe rbg rbh rbk 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 rek rer rga rgb rgc rgd rge rgg rgh rgk rgr rh- rha rhb rhc rhd rhe rhg rhh rhr rkb rkc rke rkg rkk rra rrb rrc rrd rrg rrh rrk rrr