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

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#import "WhiteFilledSquare.h"

@implementation WhiteFilledSquare

- (float) color {
    return NX_WHITE;
}

- (BOOL) isWhite {
    return YES;
}

@end

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