(defprim :not (:boolean))
(defprim :nobody ())
(defprim :one-of (t))
+(defprim :of (:reporter-block :agentset) :infix)
(defprim :patches ())
(defprim :pcolor ())
(defprim :random (:number))
(defprim :tick ())
(defprim :ticks ())
(defprim :turtles ())
+(defprim :who ())
; colors
(defprim :black ())