9 acessos
-3------8-5-3-------3-1-0-0-1-3-----------3----8-5-3-----3-1-0-0-1-3----------
---1----------1-----------------1-3-5-------1-------------------------1-3-1---
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(versão mais roqueira)
E |--------15------19-17-15------15-13-12-12-13-15---------------
B |-----------13------------13---------------------13-15-17------
cont.
E |--------15------19-17-15------15-13-12-12-13-15---------------
B |-----------13------------13---------------------13-15-13------