The color of a rule figure determines the color of figures it
creates. Red rules create black figures. Black rules create red
figures. The event figure in the head of the rule must have the same
color as the rule itself.
The figures in the rule head that are matched to figures in the
document must be the opposite color. The figures in the rule
body that replace figures in the document must also be the
opposite color. All other figures in the rule must be the
same color. These include equiv line figures, generator
figures, the main event figure in the head, and all event generating
figures in the body.
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