e---------------------------------------------------I b---------------------------------------------------I g---------7----7--5--4--5--4------------------------I X16 D---------------------------------------------------I A---------------------------------------------------I E---------------------------------------------------I e---------------------------------------------------I b---------------------------------------------------I g--5-5--9-9--10-10--11-11-11--12-12-12-12-----------I D---------------------------------------------------I X2 A--3-3--7-7--8--8---9--9--9---10-10-10-10-----------I E---------------------------------------------------I Trepal