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class Robot
def initialize
@coordinates = [0, 0]
@fired_at = []
end
 
def forward(n)
@coordinates[0] += n
end
 
def backward(n)
@coordinates[0] -= n
end
 
def right(n)
@coordinates[1] += n
end
 
def left(n)
@coordinates[1] -= n
end
end

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