pen-down, pen-erase, pen-up
a command that changes turtle’s mode to drawing lines (pen-down), removing lines (pen-erase), or neither (pen-up)
hatch, hatch-<breeds>
a command that creates a specified number of new turtles (or turtles of a specific breed) and runs any bracketed commands (if there are any) once for each turtle (or […]
link-neighbors
a reporter that reports the set of all turtles connected by a link to the turtle calling the reporter
