a-a a-b a-i aaa aab aai aao aas aau ab- aba abb abi abo abs abu ai- aia aib aii aio ais aiu aoa aob aoi aoo aos aou as- asa asb asi aso ass asu au- aua aub aui auo aus b-u baa bab bai bao bas bau bba bbb bbi bbo bbs bbu bi- bia bib bii bio bis biu boa bob boi boo bos bou bsa bsb bsi bso bss bsu bua bub bui buo bus buu ia- iaa iab iai iao ias iau iba ibb ibi ibo ibs ibu iia iib iii iio iis iiu io- ioa iob ioi ioo ios iou is- isa isb isi iso iss isu iu- iua iub iui ius o-i oaa oab oai oao oas oau ob- oba obb obi obo obs obu oia oib oii oio ois oiu oo- ooa oob ooi ooo oos os- osa osb osi oso oss osu ou- oua oui ouo ous saa sab sai sao sas sau sba sbb sbi sbo sbs sbu sia sib sii sio sis siu soa sob soi soo sos sou ss- ssa ssb ssi sso sss ssu sua sub sui suo sus suu ua- uaa uab uai uao uas uau uba ubb ubi ubo ubs ubu uia uib uii uio uis uiu uoa uob uoo uos usa usb usi uso uss usu uua uus uuu