At the time, neither "USA Today" nor "The Observer" was able to verify which of the sixty-plus candidates it was.
There is a only one sentence in the statement
There is very clearly only one sentence in the statement, I don't understand why the model can't recognize this.
( z1 sentence :quant 1 :location ( z2 thing :ARG1-of ( z3 state ) ) :mod ( z4 only ) )