umgrub[11], rubrum[10],
gurus[6],
bums[8], burg[7], grub[7], bugs[7], murr[6], rums[6], gurr[5], grus[5], guru[5], surr[4],
bum[7], bug[6], brr[5], mur[5], rum[5], bus[5], mus[5], ums[5], gur[4], rus[3], sur[3], urs[3],
um[4], ur[2],
