a-a a-b a-c aaa aab aac aag aah aam aao aar ab- aba abb abc abg abh abm abo abr ac- aca acb acc acg ach acm aco acr ag- aga agb agc agg agh agm ago agr aha ahb ahc ahg ahh ahm aho ahr ama amb amc amg amh amm amo amr aoa aob aoc aog aoh aom aoo aor ar- ara arb arc arg arh arm aro arr baa bab bac bag bah bam bao bar bba bbb bbc bbg bbh bbm bbo bbr bca bcb bcc bcg bch bcm bco bcr bga bgb bgc bgg bgh bgm bgo bgr bha bhb bhc bhg bhh bhm bho bhr bma bmb bmc bmg bmh bmm bmo bmr boa bob boc bog boh bom boo bor bra brb brg brh brm bro brr c-- caa cab cac cag cah cam cao car cba cbb cbc cbg cbh cbm cbo cbr cca ccb ccc ccg cch ccm cco ccr cga cgb cgc cgg cgh cgm cgo cgr ch- cha chb chc chg chh chm cho chr cma cmb cmc cmg cmh cmm cmo cmr co- coa cob coc cog coh com coo cor cra crb crc crg crh crm cro crr gaa gab gac gag gah gam gao gar gba gbc gbg gbh gbm gbo gbr gca gcb gcc gcg gch gcm gco gcr gga ggb ggc ggg ggh ggm ggo ggr gha ghb ghc ghg ghh gho ghr gma gmb gmc gmg gmh gmm gmo gmr goa gob goc gog goh gom goo gor gra grb grc grg grh grm gro grr haa hab hac hag hah ham hao har hba hbb hbc hbg hbh hbm hbo hbr hca hcb hcc hcg hch hcm hco hcr hga hgb hgc hgg hgh hgm hgo hgr hha hhb hhc hhg hhh hhm hho hhr hma hmb hmc hmg hmh hmm hmo hmr hoa hob hoc hog hoh hom hoo hor hr- hra hrb hrc hrg hrh hrm hro hrr m-o m-r maa mab mac mag mah mam mao mar mba mbb mbc mbg mbh mbm mbo mbr mc- mca mcb mcc mcg mch mcm mco mcr mga mgb mgc mgh mgm mgo mgr mha mhc mhg mhh mhm mho mhr mma mmb mmc mmg mmh mmm mmo mmr moa mob moc mog moh mom moo mor mra mrb mrc mrg mrh mrm mro mrr oaa oab oac oag oah oam oao oar ob- oba obb obc obg obh obm obo obr oc- oca ocb occ ocg och ocm oco ocr oga ogc ogg ogh ogo oha ohc ohg ohh ohm oho ohr om- oma omb omc omg omh omm omo omr oo- ooa oob ooc oog ooh oom ooo oor or- ora orb orc org orh orm oro orr ra- raa rab rac rag rah ram rao rar rba rbb rbc rbg rbh rbm rbo rbr rca rcb rcc rcg rch rcm rco rcr rga rgb rgc rgg rgh rgo rgr rh- rha rhb rhc rhg rhh rhm rho rhr rma rmb rmc rmg rmh rmm rmo rmr roa rob roc rog roh rom roo ror rra rrb rrc rrg rrh rrm rrr