bbb bbi bbl bbr bbt bi- bib bii bil bir bit biz blb bli bll blr blt blz brb bri brl brr brt brz btb bti btl btr btt btz bzr bzz ibb ibi ibl ibr ibt ibz iib iii iil iir iit il- ilb ili ill ilr ilt ilz ir- irb iri irl irr irt itb iti itl itt itz izi izz lbb lbi lbl lbr lbt lib lii lil lir lit liz llb lli lll llr llt llz lrb lri lrr lrt lrz ltb lti ltl ltr ltt ltz lzi lzr rbb rbi rbl rbr rbt rib rii ril rir rit riz rli rll rlr rlt rrb rri rrl rrr rrt rtb rti rtl rtr rtt rtz rzb tbb tbi tbl tbr tbt tbz tib tii til tir tit tiz tli tll tlr tlt tlz trb tri trl trr trt trz ttb tti ttl ttr ttt zbb zbl zbr zbt zib zil zir zit ziz zlr zlt zrl ztl ztr zzr zzt zzz