using System;

public class Program

{

    public static void Main()

    {

        Item weapon = new Weapon();

        Slot slot = new WeaponSlot();

        var result = slot.CanEquip(weapon);

        Console.WriteLine(result);

    }

}

​

abstract class Slot

{

    public abstract bool CanEquip(Item item);

}

​

class ArtifactSlot : Slot

{

    public override bool CanEquip(Item item) => item.CanBeEquippedIn(this);

}

​

class WeaponSlot : Slot

{

    public override bool CanEquip(Item item) => item.CanBeEquippedIn(this);

}

​

abstract class Item

{

    public abstract bool CanBeEquippedIn(ArtifactSlot slot);

    public abstract bool CanBeEquippedIn(WeaponSlot slot);

}

​

class Weapon : Item

{

    public override bool CanBeEquippedIn(ArtifactSlot slot) => false;

    public override bool CanBeEquippedIn(WeaponSlot slot) => true;

}

​

class Artifact : Item

{

    public override bool CanBeEquippedIn(ArtifactSlot slot) => true;

    public override bool CanBeEquippedIn(WeaponSlot slot) => false;

}