a-a a-b a-i aaa aab aai aas aau ab- aba abb abi abs abu ai- aia aib aii ais aiu as- asa asb asi ass asu au- aua aub aui aus b-u baa bab bai bas bau bba bbb bbi bbs bbu bi- bia bib bii bis biu bsa bsb bsi bss bsu bua bub bui bus buu ia- iaa iab iai ias iau iba ibb ibi ibs ibu iia iib iii iis iiu is- isa isb isi iss isu iu- iua iub iui ius saa sab sai sas sau sba sbb sbi sbs sbu sia sib sii sis siu ss- ssa ssb ssi sss ssu sua sub sui sus suu ua- uaa uab uai uas uau uba ubb ubi ubs ubu uia uib uii uis uiu usa usb usi uss usu uua uus uuu