intro:
e-----------------------------------------------------------------|
b-----------------------------------------------------------------|
g-----------(b9)(b9)--------------------------------------------------|
d-----11-11-----11-11-(b9)(b9)7-7-(b9)(b9)11-11---------------------------|   x2
a-0-0-------------------------------------------------------------|
e-----------------------------------------------------------------|

e-----------------------------------------------------------------|
b-----------------------------------------------------------------|
g-----------(b9)(b9)--------------------------------------------------|
d-0-0-11-11-----11-11-(b9)(b9)7-7-(b9)(b9)11-11---------------------------|   x2
a-----------------------------------------------------------------|
e-----------------------------------------------------------------|

e-----------------------------------------------------------------|
b-----------------------------------------------------------------|
g-----------------------------------------------------------------|
d-----------(b9)(b9)--------------------------------------------------|   x2
a-0-0-11-11-----11-11-(b9)(b9)7-7-(b9)(b9)11-11---------------------------|
e-----------------------------------------------------------------|

e-----------------------------------------------------------------|
b-----------------------------------------------------------------|
g-----------(b9)(b9)--------------------------------------------------|
d-0-0-11-11-----11-11-(b9)(b9)7-7-(b9)(b9)11-11---------------------------|   x1
a-----------------------------------------------------------------|
e-----------------------------------------------------------------|

e-----------------------------------------------------------------|
b-----------------------------------------------------------------|
g-----------(b9)(b9)------(b9)11-(b9)---(b9)11-(b9)---------------------------|
d-0-0-11-11-----11-11--------11-----------------------------------|   x1
a-----------------------------------------------------------------|
e-----------------------------------------------------------------|