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diff --git a/parts/django/tests/modeltests/mutually_referential/models.py b/parts/django/tests/modeltests/mutually_referential/models.py
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+++ b/parts/django/tests/modeltests/mutually_referential/models.py
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+"""
+24. Mutually referential many-to-one relationships
+
+Strings can be used instead of model literals to set up "lazy" relations.
+"""
+
+from django.db.models import *
+
+class Parent(Model):
+    name = CharField(max_length=100)
+
+    # Use a simple string for forward declarations.
+    bestchild = ForeignKey("Child", null=True, related_name="favoured_by")
+
+class Child(Model):
+    name = CharField(max_length=100)
+
+    # You can also explicitally specify the related app.
+    parent = ForeignKey("mutually_referential.Parent")