boom[7], obom[7], boot[7], boso[6], most[6], osom[5], somo[5], stoo[5],
bom[6], mob[6], bot[6], tom[5], omo[4], osm[4], som[4], oto[4], sto[4], oso[3],
bo[4], om[3], ot[3], to[3], ts[3], os[2],
