b-u bbb bbi bbo bbs bbu bi- bib bii bio bis biu biv bob boi boo bos bou bov bsb bsi bso bss bsu bsv bub bui buo bus buu bvb bvi bvo bvs bvu bvv i-v ibb ibi ibo ibs ibu ibv iib iii iio iis iiu io- iob ioi ioo ios iou iov is- isb isi iso iss isu isv iu- iub iui ius ivb ivi ivo ivs ivu ivv o-i ob- obb obi obo obs obu obv oib oii oio ois oiu oiv oo- oob ooi ooo oos oov os- osb osi oso oss osu osv ou- oui ouo ous ov- ovb ovi ovo ovs ovv sbb sbi sbo sbs sbu sbv sib sii sio sis siu siv sob soi soo sos sou sov ss- ssb ssi sso sss ssu ssv sub sui suo sus suu suv svb svi svo svs svu svv ubb ubi ubo ubs ubu ubv uib uii uio uis uiu uob uoo uos usb usi uso uss usu usv uus uuu uvb uvo uvs uvu uvv vbi vbo vbs vbv vi- vib vii vio vis viu viv vob voi voo vos vou vov vsb vsi vso vss vsu vsv vus vuv vvb vvi vvo vvs vvv