b-u bbb bbi bbl bbr bbu bi- bib bii bil bir biu biv blb bli bll blr blu blv brb bri brl brr bru brv bub bui bul bur buu bvb bvi bvl bvr bvu bvv i-v ibb ibi ibl ibr ibu ibv iib iii iil iir iiu il- ilb ili ill ilr ilu ilv ir- irb iri irl irr iru irv iu- iub iui iur ivb ivi ivl ivr ivu ivv lbb lbi lbl lbr lbu lbv lib lii lil lir liu liv llb lli lll llr llu llv lrb lri lrr lru lrv lub lui lul lur luu luv lvb lvi lvl lvr lvv rbb rbi rbl rbr rbu rib rii ril rir riv rli rll rlr rlu rrb rri rrl rrr rru rub rui rur ruu ruv rvb rvi rvl rvr rvu rvv ubb ubi ubl ubr ubu ubv uib uii uil uir uiu ulb uli ull ulr ulu ulv ur- urb uri url urr uru uur uuu uvb uvl uvu uvv vbi vbl vbr vbv vi- vib vii vil vir viu viv vl- vlb vll vlv vrb vri vrr vru vul vur vuv vvb vvi vvr vvv