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Sets Amt of Digitalis at coordinates. An Amt of 1 means fill health Digitalis, and 0 means no Digitalis.

• Lay down Digitalis on 3×3 grid under a unit
  
  The reason for the 2 is that the limit is one more than the loop iterates through. So, “3 0 do loop” goes through the values 0,1,2… but not three. Using these limits will make your walker lay down a 3×3 grid of Digitalis.
  
  

  CurrentY 2 add CurrentY 1 sub do
     CurrentX 2 add CurrentX 1 sub do
        I J true SetDigitalisGrowth
        I J 1 SetDigitalis
     Loop
  Loop
  

  
  

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