ftp.nice.ch/pub/next/games/board/Ergo.NIHS.bs.tar.gz#/Ergo/From_Article/BlackFilledSquare.h

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#import "AbstractFilledSquare.h"

@interface BlackFilledSquare : AbstractFilledSquare {}

- (float) color;
- (BOOL) isWhite;

@end

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.