intro
e-----------------------------------------------|
d-----------------------------------------------|
g----------------------11-11-11--13-14-13-11-13-|
d--11-11-11--14-14-14---------------------------|
a-----------------------------------------------|
e-----------------------------------------------|

e------------------------------------------------------|
d------------------------------------------------------|
g----------------------11-11-11--13-14-13-11-13-11-----|
d--11-11-11--14-14-14-------------------------------14-|
a------------------------------------------------------|
e------------------------------------------------------|