|------------------- |--------------------------------|
|------------------- |--------------------------------|
|------------------- |--------------------------------|
|1-2-4-5-6-7-1-2-5-6-7 |1-2-1-2-4-5-6-7-1-2-1-2-4-5-6-7-|
|1-2-4-5-6-7-1-2-5-6-7 x2 |1-2-1-2-4-5-6-7-1-2-1-2-4-5-6-7-|
|1-2-4-5-6-7-1-2-5-6-7 |1-2-1-2-4-5-6-7-1-2-1-2-4-5-6-7-|