Positions.cs

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using System.Collections;
 
namespace System.Xml.Schema;
 
internal sealed class Positions
{
    private readonly ArrayList _positions = new ArrayList();
 
    public Position this[int pos] => (Position)_positions[pos];
 
    public int Count => _positions.Count;
 
    public int Add(int symbol, object particle)
    {
        return _positions.Add(new Position(symbol, particle));
    }
}