\q1 \v=3 \v~=\w I|x-occurrence="1" x-occurrences="1"\w* \w cause|x-occurrence="1" x-occurrences="1"\w* \w the|x-occurrence="1" x-occurrences="1"\w* \w sky|x-occurrence="1" x-occurrences="1"\w* \w to|x-occurrence="1" x-occurrences="1"\w* \w become|x-occurrence="1" x-occurrences="1"\w* \w dark|x-occurrence="1" x-occurrences="1"\w*, \¬q1 \q2 \p~<