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Should an object query its owner?

I have a World class World: def __init__(self): self.size = 10 self.n_busStops = 10 self.busStopMatrix = SpatialGraph(self.size, self.n_busStops, 1.0) self.buses ...
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Object Constraint Language (OCL) for Stack in java.util package

I have an exam coming up and I'm looking at past papers to get some ideas of what to expect. I'm a bit stuck on the following one and would really appreciate if someone could give some example ...