a reporter that takes a number as input and reports the square root of that number
a reporter that stores the maximum x-coordinate for the world
a built-in turtle reporter that stores the x-coordinate of the turtle
a built-in turtle variable that reports the direction that the turtle is facing
a built-in turtle variable that reports the size of the turtle
a command takes a value as input, terminates the current to-report procedure, and reports the input value as the result of that procedure
keywords that begin and end reporter procedures
a reporter that takes a set of agents as input and reports the same set of agents except without the agent calling the reporter
