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Task: Implement LINQ SelectMany for Customer-Order Relationship in C

Task: Implement LINQ SelectMany for Customer-Order Relationship in C: a task in Terminal-Lego-15k (Harbor dataset). Create a C console application that demonstrates the use of LINQ's SelectMany method to flatten a one-to-many relationship between customers and their orders. You must implement the…

The task

Create a C# console application that demonstrates the use of LINQ's `SelectMany` method to flatten a one-to-many relationship between customers and their orders. You must implement the equivalent of a query expression with multiple `from` clauses using the `SelectMany` method syntax.

Part of PrimeIntellect/Terminal-Lego-15k.