Querying a many-to-many field based on entries' number in the relationship

Hi,
I have a model named 'Period' and a model named 'Schedule'. They have
a many-to-many relationship. I need to get all Period's whose
position in the relationship is a certain number (All second periods
in each schedule, for example).

I could use raw SQL to query the m2m database, but is this possible
without raw SQL?

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