INTRO
2x
1-5--3-1-------------------
2--------3-1-1-3-1-3-------
3---------------------2-0-2
4--------------------------
5--------------------------
6--------------------------
la segunda parte
1-3-3-1----5-3-1---------------
2---------3--------3-1--1-3-1-3
3------3-3------3-3------------
4------------------------------
5------------------------------
6------------------------------