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def get_constraint_set(self):
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"""Return the set of constraints that are valid for this provider."""
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cs = yield super(MachineProvider, self).get_constraint_set()
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# Expose EC2 instance types/zones on AWS itelf, not private clouds.
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cs.register_generics(INSTANCE_TYPES.keys())
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cs.register("ec2-zone", converter=convert_zone)