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- DEFINE "vector [[ :dir :len][setheading :dir][forward :len]]
- DEFINE "duopoly [[ :side1 :angle1 :side2 :angle2][duopoly2 :side1 :angle1 :side2 :angle2 0]]
- DEFINE "duopoly2 [[ :side1 :angle1 :side2 :angle2 :c][vector 0 + :c * :angle1 :side1][vector 0 + :c * :angle2 :side2][duopoly2 :side1 :angle1 :side2 :angle2 1 + :c]]