riggs[7], gruss[6],
rigg[6], gigs[6], giss[5], urig[5], grus[5], guss[5], riss[4], sirs[4], russ[4],
gig[5], gis[4], gur[4], sir[3], iss[3], rus[3], sur[3], urs[3],
si[2], ui[2], ur[2],