Practica 4

https://drive.google.com/open?id=1hjZpUf0LSXhrRSrPtCAxebOuHWiwBeyq https://drive.google.com/open?id=1FchHnqY6NDI_t51AMmlYY39PSMiloBgm https://drive.google.com/open?id=1O3uk_01bcLPiHaTETpWSwE4HPzkz_9vp https://drive.google.com/open?id=1vK_zaz0n-E9I4raJvgF82LkVmBxnxu4k