intro: 1/----------------------------------------------------------------------------------------------- 2/----------------------------------------------------------------------------------------------- 3/------------5-(x2)-4-(x2)-----------5-(x2)-4-(x2)--2-(x-5)------------5-(x2)--4-(x2)--5-(x2)--- 4/--5-(x10)------------------5-(x10)----------------------------5-(-x3)-------------------------- 1/-------------------------------------------------------------------- 2/-------------------------------------------------------------------- 3/--7-(x3)------------------------------------------------------------ 4/-----------5-------------------------------------------------------- Puente: 1/-------------------------------------------------------------------- 2/-------------------------------------------------------------------- 3/-----------2-(x5)-5-(x5)--7-(x5)------------------------------------ 4/---5-(x5)---------------------------5-(x5)-------------------------- E