drum[6], muds[6], rums[6], muss[6], sums[6], drud[4], suds[4], russ[4],
mud[5], mur[5], rum[5], mus[5], ums[5], dur[3], sud[3], uds[3], rus[3], sur[3], urs[3],
um[4], du[2], ud[2], ur[2],
