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from django.db import models
class Country(models.Model):
name = models.CharField(max_length=30)
class City(models.Model):
name = models.CharField(max_length=30)
country = models.ForeignKey(Country, models.CASCADE)
class Person(models.Model):
name = models.CharField(max_length=30)
born = models.ForeignKey(City, models.CASCADE, related_name='+')
died = models.ForeignKey(City, models.CASCADE, related_name='+')
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