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]]