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			Top of the CONA Hierarchy
			.... Conceptual Works (CONA facet)
			........ <C> (4)

			............ Conceptual works by class: for video, film, performing arts
			................ 4'33" (conceptual piece)
			.................... 4'33" (performance) [N]
			.................... 4'33" (performance) [N]
			.................... 4'33" (In Proportional Notation) (score) [N]