b-u bbb bbi bbm bbr bbu bbx bby bi- bib bii bim bir biu bix biy bmb bmi bmm bmr bmu bmx brb bri brm brr bru brx bry bub bui bum bur buu bux buy bxb bxi bxm bxx by- byi bym byr byu ibb ibi ibm ibr ibu ibx iby iib iii iim iir iiu iix im- imb imi imm imu imx imy ir- irb iri irm irr iru irx iry iu- iub iui ium iur ixi ixy iym iyr iyy m-r mbb mbi mbm mbr mbu mbx mi- mib mii mim mir miu mix miy mmb mmi mmm mmr mmu mmx mrb mri mrm mrr mru mrx mry mub mui mum mur muu mux muy mxi mxr mxu my- myb mym myr myu myx rbb rbi rbm rbr rbu rbx rib rii rim rir rix riy rmb rmi rmm rmr rmx rrb rri rrm rrr rru rub rui rum rur ruu rux ruy rxr ry- rym ryr ryu ryy ubb ubi ubr ubu ubx uby uib uii uim uir uiu um- umb umi umm umr umu ur- urb uri urm urr uru urx ury uum uur uuu uxb uxr uxu uyi uyu xbr xbx xii xiu xix xmi xmm xmr xmu xmx xrx xry xui xxi xxx xxy xyr xyy ybi ybm ybr yby yii yim yir ymi ymm yru yui yum yur yuu yux yuy yxy yyb yyu yyy