b-u bbb bbi bbs bbu bi- bib bii bis biu biv bsb bsi bss bsu bsv bub bui bus buu bvb bvi bvs bvu bvv i-v ibb ibi ibs ibu ibv iib iii iis iiu is- isb isi iss isu isv iu- iub iui ius ivb ivi ivs ivu ivv sbb sbi sbs sbu sbv sib sii sis siu siv ss- ssb ssi sss ssu ssv sub sui sus suu suv svb svi svs svu svv ubb ubi ubs ubu ubv uib uii uis uiu usb usi uss usu usv uus uuu uvb uvs uvu uvv vbi vbs vbv vi- vib vii vis viu viv vsb vsi vss vsu vsv vus vuv vvb vvi vvs vvv