a-a a-b aaa aab aad aae aas aau ab- aba abb abd abe abs abu ad- ada adb add ade ads adu aea aeb aed aee aes aeu as- asa asb asd ase ass asu au- aua aub aud aue aus b-u baa bab bad bae bas bau bba bbb bbd bbe bbs bbu bda bdb bdd bde bds bdu be- bea beb bed bee bes beu bsa bsb bsd bse bss bsu bua bub bud bue bus buu daa dab dad dae das dau dba dbb dbd dbe dbs dbu dda ddb ddd dde dds ddu de- dea deb ded dee des deu dsa dsb dsd dse dss dsu dua dub dud due dus eaa eab ead eae eas eau eba ebb ebd ebe ebs ebu ed- eda edb edd ede eds edu eea eeb eed eee ees es- esa esb esd ese ess esu eu- eua eub eud eue eus saa sab sad sae sas sau sba sbb sbd sbe sbs sbu sda sdb sdd sde sds sdu se- sea seb sed see ses seu ss- ssa ssb ssd sse sss ssu sua sub sud sue sus suu ua- uaa uab uad uae uas uau uba ubb ube ubs ubu uda udb udd ude uds udu uea ueb ued uee ues usa usb usd use uss usu uua uue uus uuu