a-a a-b a-c aaa aab aac aad aae aah aan ab- aba abb abc abd abe abh abn ac- aca acb acc acd ace ach acn ad- ada adb adc add ade adh adn aea aeb aec aed aee aeh aen aha ahb ahc ahd ahe ahh ahn an- ana anb anc and ane anh ann baa bab bac bad bae bah ban bba bbb bbc bbd bbe bbh bbn bca bcb bcc bcd bce bch bcn bda bdb bdc bdd bde bdh be- bea beb bec bed bee beh ben bha bhb bhc bhd bhe bhh bna bnb bnc bnd bne bnn c-- caa cab cac cad cae cah can cba cbb cbc cbd cbe cbh cbn cca ccb ccc ccd cce cch ccn cda cdb cdc cdd cde cdh cdn ce- cea ceb cec ced cee ceh cen ch- cha chb chc chd che chh chn cn- cna cnb cnc cnd cne cnh cnn daa dab dac dad dae dah dan dba dbb dbc dbd dbe dbh dbn dca dcb dcc dcd dce dcn dda ddb ddc ddd dde ddh ddn de- dea deb dec ded dee deh den dh- dha dhb dhc dhd dhe dhh dna dnb dnc dnd dne dnh dnn eaa eab eac ead eae eah ean eba ebb ebc ebd ebe ebh ebn ec- eca ecb ecc ecd ece ech ecn ed- eda edb edc edd ede edh edn eea eeb eec eed eee een eha ehb ehc ehd ehe ehh ehn en- ena enb enc end ene enh enn haa hab hac had hae hah han hba hbb hbc hbd hbe hbh hbn hca hcb hcc hcd hce hch hcn hda hdb hdc hdd hde hdh hdn he- hea heb hec hed hee heh hen hha hhb hhc hhd hhe hhh hhn hna hnb hnc hnd hne hnh hnn naa nab nac nad nae nah nan nba nbb nbc nbd nbe nbn nca ncb ncc ncd nce nch ncn nda ndb ndc ndd nde ndh ndn ne- nea neb nec ned nee neh nen nha nhb nhc nhd nhe nhh nhn nna nnb nnc nne nnh nnn