ftp.nice.ch/pub/next/games/strategic/rulerule.NIHS.bs.tar.gz#/rulerule/RuleType.h

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typedef struct _Rule {
  int buttonX, buttonY; // 0 .. 4
  int leftColor, rightColor; // 0=black, 1=white 2=yellow, 3=red, 4=blue
  int actsOn;
} Rule;

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