Revert "step0 update"

This reverts commit 8ff4ef024e8c569dc01f0d54146bde88151471e1.
Revert "Step 6 added"

This reverts commit 1d743d7256e7ac4173ea2ad95b0559f7de71c9c1.
Revert "Revert "Step 6 added""

This reverts commit 99174c4f32026a1e6bf8f9edb9aa69a727087e65.
Mistake
Revert "Mistake"

This reverts commit 610323b082c3286a75200ec07691e18e220d70b1.