-er a-a a-b a-c aaa aab aac aae aag aah aam aao aar ab- aba abb abc abe abg abh abm abo abr ac- aca acb acc ace acg ach acm aco acr aea aeb aec aee aeg aeh aem aeo aer ag- aga agb agc age agg agh agm ago agr aha ahb ahc ahe ahg ahh ahm aho ahr ama amb amc ame amg amh amm amo amr aoa aob aoc aoe aog aoh aom aoo aor ar- ara arb arc are arg arh arm aro arr baa bab bac bae bag bah bam bao bar bba bbb bbc bbe bbg bbh bbm bbo bbr bca bcb bcc bce bcg bch bcm bco bcr be- bea beb bec bee beg beh bem beo ber bga bgb bgc bge bgg bgh bgm bgo bgr bha bhb bhc bhe bhg bhh bhm bho bhr bma bmb bmc bme bmg bmh bmm bmo bmr boa bob boc boe bog boh bom boo bor bra brb bre brg brh brm bro brr c-- caa cab cac cae cag cah cam cao car cba cbb cbc cbe cbg cbh cbm cbo cbr cca ccb ccc cce ccg cch ccm cco ccr ce- cea ceb cec cee ceg ceh cem ceo cer cga cgb cgc cge cgg cgh cgm cgo cgr ch- cha chb chc che chg chh chm cho chr cma cmb cmc cme cmg cmh cmm cmo cmr co- coa cob coc coe cog coh com coo cor cra crb crc cre crg crh crm cro crr eaa eab eac eae eag eah eam eao ear eba ebb ebc ebe ebg ebh ebm ebo ebr ec- eca ecb ecc ece ecg ech ecm eco ecr eea eeb eec eee eeg eem eeo eer ega egb egc ege egg egh egm ego egr eha ehb ehc ehe ehg ehh ehm eho ehr em- ema emb emc eme emg emh emm emo emr eo- eoa eob eoc eoe eog eoh eom eoo eor era erb erc ere erg erh erm ero err gaa gab gac gae gag gah gam gao gar gba gbc gbe gbg gbh gbm gbo gbr gca gcb gcc gce gcg gch gcm gco gcr ge- gea geb gec gee geg geh gem geo ger gga ggb ggc ggg ggh ggm ggo ggr gha ghb ghc ghe ghg ghh gho ghr gma gmb gmc gme gmg gmh gmm gmo gmr goa gob goc goe gog goh gom goo gor gra grb grc gre grg grh grm gro grr haa hab hac hae hag hah ham hao har hba hbb hbc hbe hbg hbh hbm hbo hbr hca hcb hcc hce hcg hch hcm hco hcr he- hea heb hec hee heg heh hem heo her hga hgb hgc hge hgg hgh hgm hgo hgr hha hhb hhc hhe hhg hhh hhm hho hhr hma hmb hmc hme hmg hmh hmm hmo hmr hoa hob hoc hoe hog hoh hom hoo hor hr- hra hrb hrc hre hrg hrh hrm hro hrr m-o m-r maa mab mac mae mag mah mam mao mar mba mbb mbc mbe mbg mbh mbm mbo mbr mc- mca mcb mcc mce mcg mch mcm mco mcr mea meb mec mee meg meh mem meo mer mga mgb mgc mge mgh mgm mgo mgr mha mhc mhg mhh mhm mho mhr mma mmb mmc mme mmg mmh mmm mmo mmr moa mob moc moe mog moh mom moo mor mra mrb mrc mre mrg mrh mrm mro mrr oaa oab oac oae oag oah oam oao oar ob- oba obb obc obe obg obh obm obo obr oc- oca ocb occ ocg och ocm oco ocr oea oeb oec oee oeg oeh oem oeo oer oga ogc oge ogg ogh ogo oha ohc ohe ohg ohh ohm oho ohr om- oma omb omc ome omg omh omm omo omr oo- ooa oob ooc oog ooh oom ooo oor or- ora orb orc ore org orh orm oro orr ra- raa rab rac rae rag rah ram rao rar rba rbb rbc rbe rbg rbh rbm rbo rbr rca rcb rcc rce rcg rch rcm rco rcr re- rea reb rec ree reg reh rem reo rer rga rgb rgc rge rgg rgh rgo rgr rh- rha rhb rhc rhe rhg rhh rhm rho rhr rma rmb rmc rme rmg rmh rmm rmo rmr roa rob roc roe rog roh rom roo ror rra rrb rrc rrg rrh rrm rrr