a-a a-b a-c aaa aab aac aah aas aau ab- aba abb abc abh abs abu ac- aca acb acc ach acs acu aha ahb ahc ahh ahs ahu as- asa asb asc ash ass asu au- aua aub auc auh aus b-u baa bab bac bah bas bau bba bbb bbc bbh bbs bbu bca bcb bcc bch bcs bcu bha bhb bhc bhh bhs bhu bsa bsb bsc bsh bss bsu bua bub buc buh bus buu c-- caa cab cac cah cas cau cba cbb cbc cbh cbs cbu cca ccb ccc cch ccs ccu ch- cha chb chc chh chs chu csa csb csc csh css csu cua cub cuc cuh cus cuu haa hab hac hah has hau hba hbb hbc hbh hbs hbu hca hcb hcc hch hcs hha hhb hhc hhh hhs hhu hsa hsb hsc hsh hss hsu hua hub huc huh hus huu saa sab sac sah sas sau sba sbb sbc sbh sbs sbu sca scb scc sch scs scu sh- sha shb shc shh shs shu ss- ssa ssb ssc ssh sss ssu sua sub suc suh sus suu ua- uaa uab uac uah uas uau uba ubb ubc ubh ubs ubu uca ucb ucc uch ucs ucu uha uhb uhc uhh uhs uhu usa usb usc ush uss usu uua uuc uus uuu