a-a a-b a-c aaa aab aac aad aae aah aak aan ab- aba abb abc abd abe abh abk abn ac- aca acb acc acd ace ach ack acn ad- ada adb adc add ade adh adk adn aea aeb aec aed aee aeh aek aen aha ahb ahc ahd ahe ahh ahk ahn aka akb akc akd ake akh akk akn an- ana anb anc and ane anh ank ann baa bab bac bad bae bah bak ban bba bbb bbc bbd bbe bbh bbk bbn bca bcb bcc bcd bce bch bck bcn bda bdb bdc bdd bde bdh bdk be- bea beb bec bed bee beh bek ben bha bhb bhc bhd bhe bhh bhk bka bkb bkc bke bkk bkn bna bnb bnc bnd bne bnk bnn c-- caa cab cac cad cae cah cak can cba cbb cbc cbd cbe cbh cbk cbn cca ccb ccc ccd cce cch cck ccn cda cdb cdc cdd cde cdh cdk cdn ce- cea ceb cec ced cee ceh cek cen ch- cha chb chc chd che chh chk chn cka ckb ckc ckd ckh cn- cna cnb cnc cnd cne cnh cnn daa dab dac dad dae dah dak dan dba dbb dbc dbd dbe dbh dbk dbn dca dcb dcc dcd dce dck dcn dda ddb ddc ddd dde ddh ddk ddn de- dea deb dec ded dee deh dek den dh- dha dhb dhc dhd dhe dhh dhk dka dkb dkc dke dkk dna dnb dnc dnd dne dnh dnk dnn eaa eab eac ead eae eah eak ean eba ebb ebc ebd ebe ebh ebk ebn ec- eca ecb ecc ecd ece ech eck ecn ed- eda edb edc edd ede edh edk edn eea eeb eec eed eee eek een eha ehb ehc ehd ehe ehh ehn eka ekb ekc ekd eke ekh en- ena enb enc end ene enh enk enn haa hab hac had hae hah hak han hba hbb hbc hbd hbe hbh hbk hbn hca hcb hcc hcd hce hch hck hcn hda hdb hdc hdd hde hdh hdk hdn he- hea heb hec hed hee heh hek hen hha hhb hhc hhd hhe hhh hhk hhn hka hkb hkd hkh hkk hkn hna hnb hnc hnd hne hnh hnk hnn ka- kaa kab kac kad kae kah kak kan kba kbb kbc kbd kbe kbh kbk kbn kca kcb kcc kcd kce kch kck kcn kda kdb kdc kde kdh kdk ke- kea keb kec ked kee keh kek ken kha khe khh khk khn kkb kkc kke kkh kkk kkn kn- kna knc knd kne knk knn naa nab nac nad nae nah nak nan nba nbb nbc nbd nbe nbk nbn nca ncb ncc ncd nce nch nck ncn nda ndb ndc ndd nde ndh ndk ndn ne- nea neb nec ned nee neh nek nen nha nhb nhc nhd nhe nhh nhk nhn nka nkc nke nkk nkn nna nnb nnc nne nnh nnk nnn