content: ["@"]
  prototype = "@"
  prototype_set = "@ x"
  short = "get or set the current pattern value under the turtle"
  
  ["@X"]
  prototype = "@X"
  prototype_set = "@X x"
  short = "get the turtle X coordinate, or set it to x"
  
  ["@Y"]
  prototype = "@Y"
  prototype_set = "@Y x"
  short = "get the turtle Y coordinate, or set it to x"
  
  ["@MOVE"]
  prototype = "@MOVE x y"
  short = "move the turtle x cells in the X axis and y cells in the Y axis"
  
  ["@F"]
  prototype = "@F x1 y1 x2 y2"
  short = "set the turtle's fence to corners x1,y1 and x2,y2"
  
  ["@FX1"]
  prototype = "@FX1"
  prototype_set = "@FX1 x"
  short = "get the left fence line or set it to x"
  
  ["@FX2"]
  prototype = "@FX2"
  prototype_set = "@FX2 x"
  short = "get the right fence line or set it to x"
  
  ["@FY1"]
  prototype = "@FY1"
  prototype_set = "@FY1 x"
  short = "get the top fence line or set it to x"
  
  ["@FY2"]
  prototype = "@FY2"
  prototype_set = "@FY2 x"
  short = "get the bottom fence line or set it to x"
  
  ["@SPEED"]
  prototype = "@SPEED"
  prototype_set = "@SPEED x"
  short = "get the speed of the turtle's @STEP in cells per step or set it to x"
  
  ["@DIR"]
  prototype = "@DIR"
  prototype_set = "@DIR x"
  short = "get the direction of the turtle's @STEP in degrees or set it to x"
  
  ["@STEP"]
  prototype = "@STEP"
  short = "move `@SPEED`/100 cells forward in `@DIR`, triggering `@SCRIPT` on cell change"
  
  ["@BUMP"]
  prototype = "@BUMP"
  prototype_set = "@BUMP 1"
  short = "get whether the turtle fence mode is BUMP, or set it to BUMP with 1"
  
  ["@WRAP"]
  prototype = "@WRAP"
  prototype_set = "@WRAP 1"
  short = "get whether the turtle fence mode is WRAP, or set it to WRAP with 1"
  
  ["@BOUNCE"]
  prototype = "@BOUNCE"
  prototype_set = "@BOUNCE 1"
  short = "get whether the turtle fence mode is BOUNCE, or set it to BOUNCE with 1"
  
  ["@SCRIPT"]
  prototype = "@SCRIPT"
  prototype_set = "@SCRIPT x"
  short = "get which script runs when the turtle changes cells, or set it to x"
  
  ["@SHOW"]
  prototype = "@SHOW"
  prototype_set = "@SHOW 0/1"
  short = "get whether the turtle is displayed on the TRACKER screen, or turn it on or off"
  