text: # Generated by Django 3.1.12 on 2022-03-08 17:58
  
  from django.db import migrations, models
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('materials', '0105_auto_20210610_1030'),
      ]
  
      operations = [
          migrations.AddField(
              model_name='system',
              name='derived_to_from',
              field=models.ManyToManyField(blank=True, related_name='_system_derived_to_from_+', to='materials.System'),
          ),
      ]
  