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[REBOL] ' mark

From: keckman:welho at: 7-Aug-2010 23:09

Why there must be that ' -mark in front of draw functions? append plot reduce [ 'fill-pen ((r * (1.0.0)) + (g * (0.1.0)) + (b * (0.0.1))) 'polygon xy xy0 xy1 xy2 xy ] What does it mean?