hasty_abstraction.cs

class Basket
{
    private List<Products> products;

    public AddProduct(product)
    {
        if (products.Length > 3) {
            throw new Exception("Max 3 products allowed");
        }
        products.Add(product)
    }
}

class Shipment
{
    private List<Products> products;

    public AddProduct(product)
    {
        if (products.Length > 3) {
            throw new Exception("Max 3 products allowed");
        }
        products.Add(product)
    }
}

abstract class ProductContainer
{
    protected List<Products>;

    public AddProduct(product)
    {
        if (products.Length > 3) {
            throw new Exception("Max 3 products allowed");
        }
        products.Add(product)
    }
 
}

 class Basket : ProductContainer {}
 class Shipment : ProductContainer {}