a-a a-b a-q aaa aab aaq aas aau ab- aba abb abq abs abu aqa aqs as- asa asb asq ass asu au- aua aub aus b-u baa bab baq bas bau bba bbb bbq bbs bbu bsa bsb bss bsu bua bub bus buu qaa qas qau qba qbq qbs qqq qqu qsa qu- qua qus saa sab saq sas sau sba sbb sbq sbs sbu sqa sqq sqs ss- ssa ssb ssq sss ssu sua sub suq sus suu ua- uaa uab uaq uas uau uba ubb ubs ubu usa usb uss usu uua uus uuu