intro
mark V
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--10-12--------------------------------------------------------|
--------12----17-15-15--17p15--------15-17p15--15-17p15--15----|
-----------------------------17p15-17--------17--------17------|
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--17p15-17p15-17p15-19p15-19p15-19-17p15-------------------------------------------|
-----------------------------------------17p15----------15-----15------17----------|
-----------------------------------------------17p15-17----17-----17------17-------|
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