startshape PATTERN9

rule PATTERN9 {
    BOX {}
    CORNER_BOX {x  2 y  2 rotate  00}
    CORNER_BOX {x  2 y -2 rotate -90}
    CORNER_BOX {x -2 y  2 rotate  90}
    CORNER_BOX {x -2 y -2 rotate 180}
}

rule CORNER_BOX {

    SQUARE {x  0 y  0 size 0.8}
    SQUARE {x  1 y  0 size 0.8}
    SQUARE {x  2 y  0 size 0.8}

    SQUARE {x  0 y  1 size 0.8}
    SQUARE {x  1 y  1 size 0.8}

    SQUARE {x  0 y  2 size 0.8}

    NEXT_CORNER {}
}

rule NEXT_CORNER {
    CORNER_BOX  {x  3 y  0 b 0.2 s 0.9}
    LINE        {x  0 y  3 b 0.2 s 0.9 r 90}
}

rule NEXT_CORNER {
    CORNER_BOX  {x  0 y  3 b 0.2 s 0.9}
    LINE        {x  3 y  0 b 0.2 s 0.9}
}

rule LINE {
    SQUARE {size 0.8}
    LINE {x 1 r 1.5 size 0.9953}
}

rule BOX {
    SQUARE {x  2 y  1 size 0.8}
    SQUARE {x  2 y  0 size 0.8}
    SQUARE {x  2 y -1 size 0.8}

    SQUARE {x  1 y  2 size 0.8}
    SQUARE {x  1 y -2 size 0.8}

    SQUARE {x  0 y  2 size 0.8}
    SQUARE {x  0 y -2 size 0.8}

    SQUARE {x -1 y  2 size 0.8}
    SQUARE {x -1 y -2 size 0.8}

    SQUARE {x -2 y  1 size 0.8}
    SQUARE {x -2 y  0 size 0.8}
    SQUARE {x -2 y -1 size 0.8}
}