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The steps returned will be appended to the current registration collector and the first newly added step will be the active step. The steps will be grouped by the post they are returned in.
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Changes in previous steps - Removal of steps
If the user navigates back to a step that was added in another post return a change is being made in a step then all steps ahead after that step will be removed if they has been added by another post or in other words belongs to another group.
Post - New message id
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