a-a a-b a-c aaa aab aac aae aah aao aau ab- aba abb abc abe abh abo abu ac- aca acb acc ace ach aco acu aea aeb aec aee aeh aeo aeu aha ahb ahc ahe ahh aho ahu aoa aob aoc aoe aoh aoo aou au- aua aub auc aue auh auo b-u baa bab bac bae bah bao bau bba bbb bbc bbe bbh bbo bbu bca bcb bcc bce bch bco bcu be- bea beb bec bee beh beo beu bha bhb bhc bhe bhh bho bhu boa bob boc boe boh boo bou bua bub buc bue buh buo buu c-- caa cab cac cae cah cao cau cba cbb cbc cbe cbh cbo cbu cca ccb ccc cce cch cco ccu ce- cea ceb cec cee ceh ceo ceu ch- cha chb chc che chh cho chu co- coa cob coc coe coh coo cou cua cub cuc cue cuh cuo cuu eaa eab eac eae eah eao eau eba ebb ebc ebe ebh ebo ebu ec- eca ecb ecc ece ech eco ecu eea eeb eec eee eeo eha ehb ehc ehe ehh eho ehu eo- eoa eob eoc eoe eoh eoo eou eu- eua eub euc eue haa hab hac hae hah hao hau hba hbb hbc hbe hbh hbo hbu hca hcb hcc hce hch hco he- hea heb hec hee heh heo heu hha hhb hhc hhe hhh hho hhu hoa hob hoc hoe hoh hoo hou hua hub huc hue huh huo huu oaa oab oac oae oah oao oau ob- oba obb obc obe obh obo obu oc- oca ocb occ och oco ocu oea oeb oec oee oeh oeo oha ohc ohe ohh oho ohu oo- ooa oob ooc ooh ooo ou- oua ouc oue ouh ouo ua- uaa uab uac uae uah uao uau uba ubb ubc ube ubh ubo ubu uca ucb ucc uce uch uco ucu uea ueb uec uee ueh uha uhb uhc uhe uhh uho uhu uoa uob uoc uoe uoo uua uuc uue uuu