I then crumpled up one of the pieces of paper and asked if I had changed the mass of the paper.
(I; crumpled up; one of the pieces of paper; T:then) (I; asked; if I had changed the mass of the paper; T:then) Context(I asked,List([0, 55))):(I; had changed; the mass of the paper)
I asked,List([0, 55))
I I I
crumpled up asked had changed
one of the pieces of paper T:then
if I had changed the mass of the paper T:then
the mass of the paper