-er a-a a-b a-c aaa aab aac aae aah aam aao aap aar ab- aba abb abc abe abh abm abo abp abr ac- aca acb acc ace ach acm aco acp acr aea aeb aec aee aeh aem aeo aep aer aha ahb ahc ahe ahh ahm aho ahp ahr ama amb amc ame amh amm amo amp amr aoa aob aoc aoe aoh aom aoo aop aor ap- apa apb apc ape aph apm apo app apr ar- ara arb arc are arh arm aro arp arr b-p baa bab bac bae bah bam bao bap bar bba bbb bbc bbe bbh bbm bbo bbp bbr bca bcb bcc bce bch bcm bco bcp bcr be- bea beb bec bee beh bem beo bep ber bha bhb bhc bhe bhh bhm bho bhp bhr bma bmb bmc bme bmh bmm bmo bmp bmr boa bob boc boe boh bom boo bop bor bpa bpb bpc bpe bph bpm bpo bpp bpr bra brb bre brh brm bro brp brr c-- caa cab cac cae cah cam cao cap car cba cbb cbc cbe cbh cbm cbo cbp cbr cca ccb ccc cce cch ccm cco ccp ccr ce- cea ceb cec cee ceh cem ceo cep cer ch- cha chb chc che chh chm cho chp chr cma cmb cmc cme cmh cmm cmo cmp cmr co- coa cob coc coe coh com coo cop cor cpa cpb cpc cpe cph cpm cpo cpp cpr cra crb crc cre crh crm cro crp crr eaa eab eac eae eah eam eao eap ear eba ebb ebc ebe ebh ebm ebo ebp ebr ec- eca ecb ecc ece ech ecm eco ecr eea eeb eec eee eem eeo eep eer eha ehb ehc ehe ehh ehm eho ehp ehr em- ema emb emc eme emh emm emo emp emr eo- eoa eob eoc eoe eoh eom eoo eop eor ep- epa epb epc epe eph epm epo epp epr era erb erc ere erh erm ero erp err haa hab hac hae hah ham hao hap har hba hbb hbc hbe hbh hbm hbo hbp hbr hca hcb hcc hce hch hcm hco hcp hcr he- hea heb hec hee heh hem heo hep her hha hhb hhc hhe hhh hhm hho hhp hhr hma hmb hmc hme hmh hmm hmo hmp hmr hoa hob hoc hoe hoh hom hoo hop hor hpa hpb hpc hpe hph hpm hpo hpp hpr hr- hra hrb hrc hre hrh hrm hro hrp hrr m-o m-r maa mab mac mae mah mam mao map mar mba mbb mbc mbe mbh mbm mbo mbp mbr mc- mca mcb mcc mce mch mcm mco mcp mcr mea meb mec mee meh mem meo mep mer mha mhc mhh mhm mho mhp mhr mma mmb mmc mme mmh mmm mmo mmp mmr moa mob moc moe moh mom moo mop mor mpa mpb mpc mpe mph mpm mpo mpp mpr mra mrb mrc mre mrh mrm mro mrp mrr oaa oab oac oae oah oam oao oap oar ob- oba obb obc obe obh obm obo obp obr oc- oca ocb occ och ocm oco ocp ocr oea oeb oec oee oeh oem oeo oep oer oha ohc ohe ohh ohm oho ohp ohr om- oma omb omc ome omh omm omo omp omr oo- ooa oob ooc ooh oom ooo oop oor op- opa opb opc ope oph opm opo opp opr or- ora orb orc ore orh orm oro orp orr p-p paa pab pac pae pah pam pao pap par pba pbb pbc pbe pbm pbo pbp pbr pca pcb pcc pce pch pcm pco pcp pcr pea peb pec pee peh pem peo pep per pha phb phc phe phm pho php phr pma pmb pmc pme pmh pmm pmo pmp pmr poa pob poc poe poh pom poo pop por ppa ppb ppc ppe pph ppm ppo ppp ppr pra prb prc pre prh prm pro prp prr ra- raa rab rac rae rah ram rao rap rar rba rbb rbc rbe rbh rbm rbo rbp rbr rca rcb rcc rce rch rcm rco rcp rcr re- rea reb rec ree reh rem reo rep rer rh- rha rhb rhc rhe rhh rhm rho rhp rhr rma rmb rmc rme rmh rmm rmo rmp rmr roa rob roc roe roh rom roo rop ror rpa rpb rpc rpe rph rpm rpo rpp rpr rra rrb rrc rrh rrm rrp rrr