b-u bbb bbd bbm bbr bbu bdb bdd bdm bdr bdu bmb bmd bmm bmr bmu brb brd brm brr bru bub bud bum bur buu dbb dbd dbm dbr dbu ddb ddd ddm ddr ddu dmb dmd dmm dmr dmu drb drd drm drr dru dub dud dum dur m-r mbb mbd mbm mbr mbu mdb mdd mdm mdr mdu mmb mmd mmm mmr mmu mrb mrd mrm mrr mru mub mud mum mur muu rbb rbd rbm rbr rbu rdb rdd rdm rdr rdu rmb rmd rmm rmr rrb rrd rrm rrr rru rub rud rum rur ruu ubb ubr ubu udb udd udm udr udu um- umb umd umm umr umu ur- urb urd urm urr uru uum uur uuu