Y es que ya testeó esa tarde varias veces la dureza del cemento
(https://lh5.googleusercontent.com/-pKiMNMD9BmE/VaVEZHJAykI/AAAAAAABiC4/UFfq4NNRKGg/s700/_MG_9392.jpg) (https://lh5.googleusercontent.com/-pKiMNMD9BmE/VaVEZHJAykI/AAAAAAABiC4/UFfq4NNRKGg/s0/_MG_9392.jpg)