a-a a-b a-c aaa aab aac aae aam aau ab- aba abb abc abe abm abu ac- aca acb acc ace acm acu aea aeb aec aee aem aeu ama amb amc ame amm amu au- aua aub auc aue aum b-u baa bab bac bae bam bau bba bbb bbc bbe bbm bbu bca bcb bcc bce bcm bcu be- bea beb bec bee bem beu bma bmb bmc bme bmm bmu bua bub buc bue bum buu c-- caa cab cac cae cam cau cba cbb cbc cbe cbm cbu cca ccb ccc cce ccm ccu ce- cea ceb cec cee cem ceu cma cmb cmc cme cmm cmu cua cub cuc cue cum cuu eaa eab eac eae eam eau eba ebb ebc ebe ebm ebu ec- eca ecb ecc ece ecm ecu eea eeb eec eee eem em- ema emb emc eme emm emu eu- eua eub euc eue maa mab mac mae mam mau mba mbb mbc mbe mbm mbu mc- mca mcb mcc mce mcm mcu mea meb mec mee mem meu mma mmb mmc mme mmm mmu mua mub muc mue mum muu ua- uaa uab uac uae uam uau uba ubb ubc ube ubu uca ucb ucc uce ucm ucu uea ueb uec uee uem um- uma umb umc ume umm umu uua uuc uue uum uuu