The growing points created by the poly contact growing point have independent existence.

(define-growing-point ((poly up) Q-id)

(material poly)

(secrete (poly-short inhibitor) Q-id)

(tropism increasing Vdd-long)

(when (sensing? Vdd-short)

(start-growing-point (poly p-fet) Q-id)

(terminate)))

(define-growing-point ((poly p-fet) Q-id)

(material poly)

(initialize lifetime 10)

(secrete (poly-short inhibitor) Q-id)

(tropism constant Vdd-short)

(when (= lifetime 1)

(start-growing-point (diffusion p-fet Vdd))

(start-growing-point (diffusion p-fet contact)

Q-id)))

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