question: What did the critic Maurice Raynal begin to refer to Cubism in around 1917-1920 ?
answer: ` crystal ' Cubism
turker_answer: The critic Maurice Raynal began to refer to Cubism as ` crystal ` Cubism around 1917-1920 .
rule-based: The critic Maurice Raynal began to refer ` crystal ' Cubism to Cubism in around 1917-1920 .