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class Person(models.Model):
    first_name = models.CharField(max_length=50)
    last_name = models.CharField(max_length=50, blank=True)
    phone = models.CharField(max_length=15, blank=True)
    email = models.EmailField(blank=True)

       def __unicode__(self):
              return self.first_name + " " + self.last_name

class Book(models.Model):
    name = models.CharField(max_length=255)
    borrowed_by = models.ForeignKey(Person, blank=True, null=True)
    borrowed_on = models.DateField(blank=True, null=True)

       def __unicode__(self):
              return self.name