\q1
\v=4
\v~=\w Silver|x-occurrence="1" x-occurrences="1"\w* \w cannot|x-occurrence="1" x-occurrences="1"\w* \w be|x-occurrence="1" x-occurrences="1"\w* \w used|x-occurrence="1" x-occurrences="1"\w* \w by|x-occurrence="1" x-occurrences="1"\w* \w the|x-occurrence="1" x-occurrences="2"\w* \w metal|x-occurrence="1" x-occurrences="1"\w* \w worker|x-occurrence="1" x-occurrences="1"\w*,
\¬q1
\q2
\p~<<q2=\w unless|x-occurrence="1" x-occurrences="1"\w* \w the|x-occurrence="2" x-occurrences="2"\w* \w silver|x-occurrence="1" x-occurrences="1"\w* \w is|x-occurrence="1" x-occurrences="2"\w* \w heated|x-occurrence="1" x-occurrences="1"\w* \w and|x-occurrence="1" x-occurrences="1"\w* \w dross|x-occurrence="1" x-occurrences="1"\w* \w is|x-occurrence="2" x-occurrences="2"\w* \w removed|x-occurrence="1" x-occurrences="1"\w* \w from|x-occurrence="1" x-occurrences="1"\w* \w it|x-occurrence="1" x-occurrences="1"\w*;
\¬q2
\¬v