They found one room, 8 ft by 8 ft, containing a few blocks, dumbbell weights, and a large wooden spool of the type used by electrical contractors.
(the type; used; by electrical contractors) (They; found; one room) Context(They found,List([0, 10))):(They; found one room containing; a few blocks, dumbbell weights)
They found,List([0, 10))
the type They They
used found found one room containing
by electrical contractors
one room
a few blocks, dumbbell weights