Intro :
1)
|------------------------------------------------------------------------|
|------------------------------------------------------------------------|
|---9-11-------9-11-----------9-11--------9-11-----------9-11-------9-11-|
|------------------------------------------------------------------------|
|9------9-9-9--------9-9-9-7-------7-7-7--------7-7-7--------------------|
|----------------------------------------------------9--------9-9-9------|
2)
|------------------------------------------------------------------------|
|------------------------------------------------------------------------|
|-------9-11---------9-11---------9-11-----------------------------------|
|------------------------------------------------------------------------|
|------------------------------------------------9-----------------------|
|9-9-9-------9-9-9-10----11-11-11-------11-11-11-------------------------|
à la fin du 2, revenir au 1