question: How many times did Frédéric and Liszt collaborate in performances during the years of 1833 to 1841 ?
answer: seven
turker_answer: Frédéric and Liszt collaborated seven times in performances during the years of 1833 to 1841 .
rule-based: Frédéric and Liszt collaborated seven in performances during the years of 1833 to 1841 .