public void AddProductionInstructions(ref List <Instruction> instructions, ref Coordinates start, string itemType)
    {
        Manual manual = manualManager.GetManual(itemType);

        AddResourceInstructions(ref instructions, ref start, new List <string>(manual.Items));

        List <Coordinates> path;

        path = navigationServices.GetPath(start, "Assembler", new List <string> {
            itemType
        }, null);
        if (path == null)
        {
            Debug.LogError("Workstation not available!");
            return;
        }

        Instruction instruction = new Instruction(path, "Assembler");

        instruction.Output = new List <string>(manual.Items);
        instruction.AddInput(itemType);
        instructions.Add(instruction);

        start = path[path.Count - 1];
    }