S1U1B3F4L1O1O1R1
13 points
SUBFLOOR is validvalid
a rough floor laid as a base for a finished floor [n SUBFLOORS]
a rough floor laid as a base for a finished floor [n -S]
a rough floor laid as a base for a finished floor [n SUBFLOORS]
a rough floor laid as a base for a finished floor [n -S]