-er a-a a-b a-c aaa aab aac aad aae aah aan aar ab- aba abb abc abd abe abh abn abr ac- aca acb acc acd ace ach acn acr ad- ada adb adc add ade adh adn adr aea aeb aec aed aee aeh aen aer aha ahb ahc ahd ahe ahh ahn ahr an- ana anb anc and ane anh ann anr ar- ara arb arc ard are arh arn arr baa bab bac bad bae bah ban bar bba bbb bbc bbd bbe bbh bbn bbr bca bcb bcc bcd bce bch bcn bcr bda bdb bdc bdd bde bdh bdr be- bea beb bec bed bee beh ben ber bha bhb bhc bhd bhe bhh bhr bna bnb bnc bnd bne bnn bnr bra brb brd bre brh brn brr c-- caa cab cac cad cae cah can car cba cbb cbc cbd cbe cbh cbn cbr cca ccb ccc ccd cce cch ccn ccr cda cdb cdc cdd cde cdh cdn cdr ce- cea ceb cec ced cee ceh cen cer ch- cha chb chc chd che chh chn chr cn- cna cnb cnc cnd cne cnh cnn cnr cra crb crc crd cre crh crn crr daa dab dac dad dae dah dan dar dba dbb dbc dbd dbe dbh dbn dbr dca dcb dcc dcd dce dcn dcr dda ddb ddc ddd dde ddh ddn ddr de- dea deb dec ded dee deh den der dh- dha dhb dhc dhd dhe dhh dhr dna dnb dnc dnd dne dnh dnn dnr dra drb drc drd dre drn drr eaa eab eac ead eae eah ean ear eba ebb ebc ebd ebe ebh ebn ebr ec- eca ecb ecc ecd ece ech ecn ecr ed- eda edb edc edd ede edh edn edr eea eeb eec eed eee een eer eha ehb ehc ehd ehe ehh ehn ehr en- ena enb enc end ene enh enn enr era erb erc erd ere erh ern err haa hab hac had hae hah han har hba hbb hbc hbd hbe hbh hbn hbr hca hcb hcc hcd hce hch hcn hcr hda hdb hdc hdd hde hdh hdn hdr he- hea heb hec hed hee heh hen her hha hhb hhc hhd hhe hhh hhn hhr hna hnb hnc hnd hne hnh hnn hr- hra hrb hrc hrd hre hrh hrn hrr naa nab nac nad nae nah nan nar nba nbb nbc nbd nbe nbn nbr nca ncb ncc ncd nce nch ncn ncr nda ndb ndc ndd nde ndh ndn ndr ne- nea neb nec ned nee neh nen ner nha nhb nhc nhd nhe nhh nhn nhr nna nnb nnc nne nnh nnn nra nrb nrc nrd nre nrn nrr ra- raa rab rac rad rae rah ran rar rba rbb rbc rbd rbe rbh rbn rbr rca rcb rcc rcd rce rch rcn rcr rda rdb rdc rdd rde rdh rdn rdr re- rea reb rec red ree reh ren rer rh- rha rhb rhc rhd rhe rhh rhn rhr rna rnb rnc rnd rnh rnn rnr rra rrb rrc rrd rrh rrn rrr