\v=4
\v~=\w On|x-occurrence="1" x-occurrences="1"\w* \w each|x-occurrence="1" x-occurrences="2"\w* \w of|x-occurrence="1" x-occurrences="2"\w* \w the|x-occurrence="1" x-occurrences="1"\w* \w two|x-occurrence="1" x-occurrences="1"\w* \w side|x-occurrence="1" x-occurrences="1"\w* \w walls|x-occurrence="1" x-occurrences="1"\w* \w there|x-occurrence="1" x-occurrences="1"\w* \w were|x-occurrence="1" x-occurrences="1"\w* \w three|x-occurrence="1" x-occurrences="1"\w* \w sets|x-occurrence="1" x-occurrences="1"\w* \w of|x-occurrence="2" x-occurrences="2"\w* \w windows|x-occurrence="1" x-occurrences="1"\w* \w facing|x-occurrence="1" x-occurrences="1"\w* \w each|x-occurrence="2" x-occurrences="2"\w* \w other|x-occurrence="1" x-occurrences="1"\w*.
\¬v