Main I |---------------------------- |---------------------------- |---------------------------- |----6-6-6-6-6-6--4-4-4-2-4-4 |----4-4-4-6-4-4--2-2-2-2-2-2 |----4-4-4-4-4-4--0-0-0-0-0-0
main Ii |---------------------------- |---------------------------- |---------------------------- |----6-6-6-6-6-6--4-4-4-2-4-4tcon