public EnemyTextBox RegisterEnemy(Enemy enemy, double bias)
        {
            var text = texts[(int)(texts.Count * BiasedRandom(bias))];
            var textBox = new EnemyTextBox(game, text);
            trie.Put(text, enemy);

            return textBox;
        }
        public EnemyTextBox RegisterEnemy(Enemy enemy, double bias)
        {
            var text    = texts[(int)(texts.Count * BiasedRandom(bias))];
            var textBox = new EnemyTextBox(game, text);

            trie.Put(text, enemy);

            return(textBox);
        }