a reporter that reports a random y-coordinate from the allowable range
a reporter that reports a random x-coordinate from the allowable range
a reporter that takes a number as input and reports a random integer between the input number and zero (including zero but excluding the input number)
a command that takes a number as input and turns the turtle left that number of degrees
a command that takes a Boolean expression and a set of commands as input and runs the commands if the Boolean expression is true and does nothing if it is […]
a command moves the turtle forward a specified number of steps
a reporter that takes a set of agents as input and reports the number of agents in the set
a built-in turtle or link variable that reports the color of the turtle or link
