a-a a-b a-c aaa aab aac aah aam aan aao aar ab- aba abb abc abh abm abn abo abr ac- aca acb acc ach acm acn aco acr aha ahb ahc ahh ahm ahn aho ahr ama amb amc amh amm amn amo amr an- ana anb anc anh anm ann ano anr aoa aob aoc aoh aom aon aoo aor ar- ara arb arc arh arm arn aro arr baa bab bac bah bam ban bao bar bba bbb bbc bbh bbm bbn bbo bbr bca bcb bcc bch bcm bcn bco bcr bha bhb bhc bhh bhm bho bhr bma bmb bmc bmh bmm bmn bmo bmr bna bnb bnc bnn bno bnr boa bob boc boh bom bon boo bor bra brb brh brm brn bro brr c-- caa cab cac cah cam can cao car cba cbb cbc cbh cbm cbn cbo cbr cca ccb ccc cch ccm ccn cco ccr ch- cha chb chc chh chm chn cho chr cma cmb cmc cmh cmm cmn cmo cmr cn- cna cnb cnc cnh cnm cnn cno cnr co- coa cob coc coh com con coo cor cra crb crc crh crm crn cro crr haa hab hac hah ham han hao har hba hbb hbc hbh hbm hbn hbo hbr hca hcb hcc hch hcm hcn hco hcr hha hhb hhc hhh hhm hhn hho hhr hma hmb hmc hmh hmm hmo hmr hna hnb hnc hnh hnn hno hoa hob hoc hoh hom hon hoo hor hr- hra hrb hrc hrh hrm hrn hro hrr m-o m-r maa mab mac mah mam man mao mar mba mbb mbc mbh mbm mbo mbr mc- mca mcb mcc mch mcm mcn mco mcr mha mhc mhh mhm mhn mho mhr mma mmb mmc mmh mmm mmn mmo mmr mna mnb mnc mnm mnn mno mnr moa mob moc moh mom mon moo mor mra mrb mrc mrh mrm mrn mro mrr naa nab nac nah nam nan nao nar nba nbb nbc nbm nbn nbo nbr nca ncb ncc nch ncm ncn nco ncr nha nhb nhc nhh nhm nhn nhr nma nmb nmc nmh nmm nmn nmo nmr nna nnb nnc nnh nnm nnn nno no- noa nob noc noh nom non noo nor nra nrb nrc nrm nrn nro nrr oaa oab oac oah oam oan oao oar ob- oba obb obc obh obm obn obo obr oc- oca ocb occ och ocm ocn oco ocr oha ohc ohh ohm ohn oho ohr om- oma omb omc omh omm omn omo omr on- ona onb onc onh onn ono onr oo- ooa oob ooc ooh oom oon ooo oor or- ora orb orc orh orm orn oro orr ra- raa rab rac rah ram ran rao rar rba rbb rbc rbh rbm rbn rbo rbr rca rcb rcc rch rcm rcn rco rcr rh- rha rhb rhc rhh rhm rhn rho rhr rma rmb rmc rmh rmm rmn rmo rmr rna rnb rnc rnh rnm rnn rno rnr roa rob roc roh rom ron roo ror rra rrb rrc rrh rrm rrn rrr