In the 1930s Walter Knott began growing a new strain of berry, the boysenberry, and it soon became a booming enterprise.
Boysenberry is a strain of berry that Walter Knott started.
mnli hypothesis: Boysenberry is a strain of berry that Walter Knott started. premise: In the 1930s Walter Knott began growing a new strain of berry, the boysenberry, and it soon became a booming enterprise.