-er a-a a-b a-c aaa aab aac aae aah aam aao aar ab- aba abb abc abe abh abm abo abr ac- aca acb acc ace ach acm aco acr aea aeb aec aee aeh aem aeo aer aha ahb ahc ahe ahh ahm aho ahr ama amb amc ame amh amm amo amr aoa aob aoc aoe aoh aom aoo aor ar- ara arb arc are arh arm aro arr baa bab bac bae bah bam bao bar bba bbb bbc bbe bbh bbm bbo bbr bca bcb bcc bce bch bcm bco bcr be- bea beb bec bee beh bem beo ber bha bhb bhc bhe bhh bhm bho bhr bma bmb bmc bme bmh bmm bmo bmr boa bob boc boe boh bom boo bor bra brb bre brh brm bro brr c-- caa cab cac cae cah cam cao car cba cbb cbc cbe cbh cbm cbo cbr cca ccb ccc cce cch ccm cco ccr ce- cea ceb cec cee ceh cem ceo cer ch- cha chb chc che chh chm cho chr cma cmb cmc cme cmh cmm cmo cmr co- coa cob coc coe coh com coo cor cra crb crc cre crh crm cro crr eaa eab eac eae eah eam eao ear eba ebb ebc ebe ebh ebm ebo ebr ec- eca ecb ecc ece ech ecm eco ecr eea eeb eec eee eem eeo eer eha ehb ehc ehe ehh ehm eho ehr em- ema emb emc eme emh emm emo emr eo- eoa eob eoc eoe eoh eom eoo eor era erb erc ere erh erm ero err haa hab hac hae hah ham hao har hba hbb hbc hbe hbh hbm hbo hbr hca hcb hcc hce hch hcm hco hcr he- hea heb hec hee heh hem heo her hha hhb hhc hhe hhh hhm hho hhr hma hmb hmc hme hmh hmm hmo hmr hoa hob hoc hoe hoh hom hoo hor hr- hra hrb hrc hre hrh hrm hro hrr m-o m-r maa mab mac mae mah mam mao mar mba mbb mbc mbe mbh mbm mbo mbr mc- mca mcb mcc mce mch mcm mco mcr mea meb mec mee meh mem meo mer mha mhc mhh mhm mho mhr mma mmb mmc mme mmh mmm mmo mmr moa mob moc moe moh mom moo mor mra mrb mrc mre mrh mrm mro mrr oaa oab oac oae oah oam oao oar ob- oba obb obc obe obh obm obo obr oc- oca ocb occ och ocm oco ocr oea oeb oec oee oeh oem oeo oer oha ohc ohe ohh ohm oho ohr om- oma omb omc ome omh omm omo omr oo- ooa oob ooc ooh oom ooo oor or- ora orb orc ore orh orm oro orr ra- raa rab rac rae rah ram rao rar rba rbb rbc rbe rbh rbm rbo rbr rca rcb rcc rce rch rcm rco rcr re- rea reb rec ree reh rem reo rer rh- rha rhb rhc rhe rhh rhm rho rhr rma rmb rmc rme rmh rmm rmo rmr roa rob roc roe roh rom roo ror rra rrb rrc rrh rrm rrr