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startshape PICS background {b -1}

rule PICS {

PIC {}
PICS {x 1.1 r 90}

}

rule PIC {

SQUARE {b 1 hue 100 sat 0.5 alpha -0.5}
SQUARE {x 1.1 b 1 hue 200 sat 0.5 alpha -0.5}
SQUARE {y 1.1 b 1 hue 300 sat 0.5 alpha -0.5}
SQUARE {x 1.1 y 1.1 b 1 hue 0 sat 0.5 alpha -0.5}

}

rule PICS {

PIC {}
PICS {x 1.1 r -90}

}

rule PICS {

PIC {}
PICS {x 1.1 r 180}

}

rule PICS {

PIC {}
PICS {x 1.1 }

}

rule PICS 0.5 {

PIC{}
PICS {x 1.1 r 4}

}

rule PICS 0.1 {}