Justice, we are not making an empirical claim at all. Nothing in our Copyright Clause claim hangs upon the empirical assertion about impeding progress. Our only argument is, this is a structural limit necessary to assure that what would be an effectively perpetual term not be permitted under the copyright laws.
The passage mentions more than one argument. 
The passage only mentions one argument. 
( z1 mention :ARG0 ( z2 passage ) :ARG1 ( z3 argue :quant ( z4 more-than :op 1 ) ) )