Pivot table for three tables

I'm new in Laravel's world and I need to create a pivot table BUT for three tables, I've searched but each time I find the pivot table for two tables, for my case, I have users table, Roles table and network table, I want to add a fourth table where I can find the user_id, role_id and network_id. actually I'm confused how to use the many to many relationship. can you help me ?

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