a-a a-b a-q aaa aab aaq aas aau aay ab- aba abb abq abs abu aby aqa aqs as- asa asb asq ass asu asy au- aua aub aus ay- aya ays ayu b-u baa bab baq bas bau bay bba bbb bbq bbs bbu bby bsa bsb bss bsu bsy bua bub bus buu buy by- bya byq bys byu qaa qas qau qba qbq qbs qqq qqu qsa qu- qua qus quy saa sab saq sas sau say sba sbb sbq sbs sbu sby sqa sqq sqs ss- ssa ssb ssq sss ssu sua sub suq sus suu suy sy- sya syb sys syu ua- uaa uab uaq uas uau uay uba ubb ubs ubu uby usa usb uss usu uua uus uuu uys uyu yaa yab yas yau yay ybs yby yqb ysa ysb yss ysu ysy yua yus yuu yuy yyb yys yyu yyy