\v=25
\v~=\w ஒரு|x-occurrence="1" x-occurrences="1"\w* \w கடிதத்தையும்|x-occurrence="1" x-occurrences="1"\w* \w எழுதினான்|x-occurrence="1" x-occurrences="1"\w*; \w அதின்|x-occurrence="1" x-occurrences="1"\w* \w விபரமாவது|x-occurrence="1" x-occurrences="1"\w*: 
\¬v