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django__django-14730

Based on my knowledge of Django's codebase and the issue description, I can create the patch. The issue is about adding a system check that raises an error when developers define a related_name on symmetrical ManyToManyFields.

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Content

Based on my knowledge of Django's codebase and the issue description, I can create the patch. The issue is about adding a system check that raises an error when developers define a `related_name` on symmetrical ManyToManyFields.

In Django:
1. ManyToManyField is defined in `django/db/models/fields/related.py`
2. System checks for related fields are in the same file, within the field's `_check_*` methods
3. When a ManyToManyField is symmetrical (either explicitly or implicitly for self-referential fields), the reverse relation is not created, so `related_name` is meaningless

The check should b

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