-er a-a a-b aaa aab aae aah aam aao aar aax ab- aba abb abe abh abm abo abr abx aea aeb aee aeh aem aeo aer aex aha ahb ahe ahh ahm aho ahr ahx ama amb ame amh amm amo amr amx aoa aob aoe aoh aom aoo aor aox ar- ara arb are arh arm aro arr arx ax- axa axe axh axm axo axr axx baa bab bae bah bam bao bar bax bba bbb bbe bbh bbm bbo bbr bbx be- bea beb bee beh bem beo ber bex bha bhb bhe bhh bhm bho bhr bhx bma bmb bme bmh bmm bmo bmr bmx boa bob boe boh bom boo bor box bra brb bre brh brm bro brr brx bxb bxm bxo bxx eaa eab eae eah eam eao ear eax eba ebb ebe ebh ebm ebo ebr ebx eea eeb eee eem eeo eer eex eha ehb ehe ehh ehm eho ehr em- ema emb eme emh emm emo emr emx eo- eoa eob eoe eoh eom eoo eor era erb ere erh erm ero err ex- exa exe exh exo exr exx haa hab hae hah ham hao har hax hba hbb hbe hbh hbm hbo hbr hbx he- hea heb hee heh hem heo her hex hha hhb hhe hhh hhm hho hhr hma hmb hme hmh hmm hmo hmr hmx hoa hob hoe hoh hom hoo hor hox hr- hra hrb hre hrh hrm hro hrr hxm m-o m-r maa mab mae mah mam mao mar max mba mbb mbe mbh mbm mbo mbr mbx mea meb mee meh mem meo mer mex mha mhh mhm mho mhr mhx mma mmb mme mmh mmm mmo mmr mmx moa mob moe moh mom moo mor mox mra mrb mre mrh mrm mro mrr mrx mxa mxr oaa oab oae oah oam oao oar oax ob- oba obb obe obh obm obo obr obx oea oeb oee oeh oem oeo oer oex oha ohe ohh ohm oho ohr om- oma omb ome omh omm omo omr omx oo- ooa oob ooh oom ooo oor oox or- ora orb ore orh orm oro orr orx ox- oxa oxb oxo oxx ra- raa rab rae rah ram rao rar rax rba rbb rbe rbh rbm rbo rbr rbx re- rea reb ree reh rem reo rer rex rh- rha rhb rhe rhh rhm rho rhr rma rmb rme rmh rmm rmo rmr rmx roa rob roe roh rom roo ror rox rra rrb rrh rrm rrr rxr xaa xam xar xbe xbr xbx xee xem xer xex xma xmh xmm xmo xmr xmx xoa xom xoo xor xox xrx xxo xxx