12 Lesson... Definitions!

define movewall:

while front_is_clear:

move

define pickall:

while next_to_a_beeper:

pickbeeper

define clearwall:

pickall

while front_is_clear:

move

pickall

define turneast:

while not_facing_east:

turnleft

define turnwest:

while not_facing_west:

turnleft

define turnnorth:

while not_facing_north:

turnleft

define turnsouth:

while not_facing_south:

turnleft