I'm having issues ```javascript "tick": function(pix){ let {x, y} = pix; deletePixel(x+1,

I'm having issues
  "tick": function(pix){
    let {x, y} = pix;
    deletePixel(x+1, y);
    deletePixel(x-1, y);
    deletePixel(x, y+1);
    deletePixel(x, y-1);
    deletePixel(x+1, y+1);
    deletePixel(x-1, y+1);
    deletePixel(x+1, y-1);
    deletePixel(x-1, y-1);
  }
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