a-a a-b a-c aaa aab aac aae aag aas aau ab- aba abb abc abe abg abs abu ac- aca acb acc ace acg acs acu aea aeb aec aee aeg aes aeu ag- aga agb agc age agg ags agu as- asa asb asc ase asg ass asu au- aua aub auc aue aug aus b-u baa bab bac bae bag bas bau bba bbb bbc bbe bbg bbs bbu bca bcb bcc bce bcg bcs bcu be- bea beb bec bee beg bes beu bga bgb bgc bge bgg bgs bgu bsa bsb bsc bse bsg bss bsu bua bub buc bue bug bus buu c-- caa cab cac cae cag cas cau cba cbb cbc cbe cbg cbs cbu cca ccb ccc cce ccg ccs ccu ce- cea ceb cec cee ceg ces ceu cga cgb cgc cge cgg cgs cgu csa csb csc cse csg css csu cua cub cuc cue cug cus cuu eaa eab eac eae eag eas eau eba ebb ebc ebe ebg ebs ebu ec- eca ecb ecc ece ecg ecs ecu eea eeb eec eee eeg ees ega egb egc ege egg egs egu es- esa esb esc ese esg ess esu eu- eua eub euc eue eug eus gaa gab gac gae gag gas gau gba gbc gbe gbg gbs gbu gca gcb gcc gce gcg gcs gcu ge- gea geb gec gee geg ges geu gga ggb ggc ggg ggs ggu gsa gsb gsc gse gsg gss gsu gu- gua gub guc gue gug gus guu saa sab sac sae sag sas sau sba sbb sbc sbe sbg sbs sbu sca scb scc sce scg scs scu se- sea seb sec see seg ses seu sga sgb sgc sge sgg sgs sgu ss- ssa ssb ssc sse ssg sss ssu sua sub suc sue sug sus suu ua- uaa uab uac uae uag uas uau uba ubb ubc ube ubg ubs ubu uca ucb ucc uce ucg ucs ucu uea ueb uec uee ueg ues uga ugb ugc uge ugg ugs ugu usa usb usc use usg uss usu uua uuc uue uug uus uuu