a-a a-b a-c aaa aab aac aae aah aan aao aau ab- aba abb abc abe abh abn abo abu ac- aca acb acc ace ach acn aco acu aea aeb aec aee aeh aen aeo aeu aha ahb ahc ahe ahh ahn aho ahu an- ana anb anc ane anh ann ano anu aoa aob aoc aoe aoh aon aoo aou au- aua aub auc aue auh aun auo b-u baa bab bac bae bah ban bao bau bba bbb bbc bbe bbh bbn bbo bbu bca bcb bcc bce bch bcn bco bcu be- bea beb bec bee beh ben beo beu bha bhb bhc bhe bhh bho bhu bna bnb bnc bne bnn bno bnu boa bob boc boe boh bon boo bou bua bub buc bue buh bun buo buu c-- caa cab cac cae cah can cao cau cba cbb cbc cbe cbh cbn cbo cbu cca ccb ccc cce cch ccn cco ccu ce- cea ceb cec cee ceh cen ceo ceu ch- cha chb chc che chh chn cho chu cn- cna cnb cnc cne cnh cnn cno cnu co- coa cob coc coe coh con coo cou cua cub cuc cue cuh cun cuo cuu eaa eab eac eae eah ean eao eau eba ebb ebc ebe ebh ebn ebo ebu ec- eca ecb ecc ece ech ecn eco ecu eea eeb eec eee een eeo eha ehb ehc ehe ehh ehn eho ehu en- ena enb enc ene enh enn eno enu eo- eoa eob eoc eoe eoh eon eoo eou eu- eua eub euc eue eun haa hab hac hae hah han hao hau hba hbb hbc hbe hbh hbn hbo hbu hca hcb hcc hce hch hcn hco he- hea heb hec hee heh hen heo heu hha hhb hhc hhe hhh hhn hho hhu hna hnb hnc hne hnh hnn hno hnu hoa hob hoc hoe hoh hon hoo hou hua hub huc hue huh hun huo huu naa nab nac nae nah nan nao nau nba nbb nbc nbe nbn nbo nbu nca ncb ncc nce nch ncn nco ncu ne- nea neb nec nee neh nen neo neu nha nhb nhc nhe nhh nhn nhu nna nnb nnc nne nnh nnn nno nnu no- noa nob noc noe noh non noo nou nua nub nuc nue nuh nun nuo nuu oaa oab oac oae oah oan oao oau ob- oba obb obc obe obh obn obo obu oc- oca ocb occ och ocn oco ocu oea oeb oec oee oeh oen oeo oha ohc ohe ohh ohn oho ohu on- ona onb onc one onh onn ono onu oo- ooa oob ooc ooh oon ooo ou- oua ouc oue ouh oun ouo ua- uaa uab uac uae uah uan uao uau uba ubb ubc ube ubh ubn ubo ubu uca ucb ucc uce uch ucn uco ucu uea ueb uec uee ueh uen uha uhb uhc uhe uhh uho uhu un- una unb unc une unh unn uno unu uoa uob uoc uoe uon uoo uua uuc uue uun uuu