U.S. light crude was trading erratically on the New York Mercantile Exchange, hitting $44.50 a barrel before easing back a bit to $44.10, still a gain of $1.27.
U.S. light crude is different from U.S. heavy crude.
( z1 differ :ARG1 ( z2 crude :ARG1-of ( z3 light ) :mod ( z4 country :name ( z5 name :op "U.S." ) ) ) :ARG2 ( z6 crude :mod ( z7 heavy ) :mod z4 ) )