Enrollment continued until theoretical saturation was obtained, i.e., the point at which no new concepts were emerging in well-characterized and differentiated categories [18]. https://nighthitgames.com/%EC%8A%A4%EC%9B%A8%EB%94%94%EC%8B%9C-%EB%A7%88%EC%82%AC%EC%A7%80-%EC%99%9C-%EC%9D%B4%EB%A0%87%EA%B2%8C-%EC%9D%B8%EA%B8%B0-%EC%9E%88%EC%9D%84%EA%B9%8C/