 
 //Revuelve aleatoriamente los elementos de un arreglo
 function shuffle(array) {

    const arr = array.slice();

    for (let i = arr.length - 1; i > 0; i--) {

      const j = Math.floor(Math.random() * (i + 1));

      [arr[i], arr[j]] = [arr[j], arr[i]];

    }

    return arr;

  }
