startshape WHOLE

rule WHOLE {
	QUAD { x -0.5 y -0.5 }
	QUAD { x  0.5 y -0.5 }
	QUAD { x  0.5 y  0.5 }
	QUAD { x -0.5 y  0.5 }
}

rule QUAD {
	FILL { }
}
rule QUAD 5 {
	WHOLE { size 0.45 r 2 }
}
rule QUAD 0.5 {
	// nothing
}

rule FILL {
	SQUARE {
		size 0.8
	}
}
