||------13-12-----------------------------------------||
||---15-------15-13-------15---15-13----------13-15---||
||*-----------------14---------------14-12-----------*||
||*--------------------15------------------15--------*||
||----------------------------------------------------||
||----------------------------------------------------||
repeat a few times and then the ending:
|-----13-12-------------------------------|
|--15-------15-13------------------15-15--|
|-----------------14----------------------|
|--------------------15-14-12-12----------|
|-----------------------------------------|
|-----------------------------------------|
| 
