K2 Studio list item permission

How can I do the following in K2 Studio workflow (Blackpearl v4.6.10): 1. Remove all permissions from a SharePoint 2010 list item (document) 2. Add specific users with various permissions for the same list item Please provide step-by-step Thanks Steve

I believe there are some events (both in the web designer as well as K2 Studio/Visual Studio) to remove permission on list item:
And perhaps add permission as necessary:
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