a-a a-b a-c aaa aab aac aae aam aao aau ab- aba abb abc abe abm abo abu ac- aca acb acc ace acm aco acu aea aeb aec aee aem aeo aeu ama amb amc ame amm amo amu aoa aob aoc aoe aom aoo aou au- aua aub auc aue aum auo b-u baa bab bac bae bam bao bau bba bbb bbc bbe bbm bbo bbu bca bcb bcc bce bcm bco bcu be- bea beb bec bee bem beo beu bma bmb bmc bme bmm bmo bmu boa bob boc boe bom boo bou bua bub buc bue bum buo buu c-- caa cab cac cae cam cao cau cba cbb cbc cbe cbm cbo cbu cca ccb ccc cce ccm cco ccu ce- cea ceb cec cee cem ceo ceu cma cmb cmc cme cmm cmo cmu co- coa cob coc coe com coo cou cua cub cuc cue cum cuo cuu eaa eab eac eae eam eao eau eba ebb ebc ebe ebm ebo ebu ec- eca ecb ecc ece ecm eco ecu eea eeb eec eee eem eeo em- ema emb emc eme emm emo emu eo- eoa eob eoc eoe eom eoo eou eu- eua eub euc eue m-o maa mab mac mae mam mao mau mba mbb mbc mbe mbm mbo mbu mc- mca mcb mcc mce mcm mco mcu mea meb mec mee mem meo meu mma mmb mmc mme mmm mmo mmu moa mob moc moe mom moo mou mua mub muc mue mum muu oaa oab oac oae oam oao oau ob- oba obb obc obe obm obo obu oc- oca ocb occ ocm oco ocu oea oeb oec oee oem oeo om- oma omb omc ome omm omo omu oo- ooa oob ooc oom ooo ou- oua ouc oue oum ouo ua- uaa uab uac uae uam uao uau uba ubb ubc ube ubo ubu uca ucb ucc uce ucm uco ucu uea ueb uec uee uem um- uma umb umc ume umm umo umu uoa uob uoc uoe uom uoo uua uuc uue uum uuu