[AS] How to change a paragraph style within any folder in Find Grep?

Question

I want to change both text and paragraph style
I do that job very easily until I put paragraph styles in a folder
How to express the paragraph style "passage" within the folder "1st" in AppleScript?
In line 18 below, "1st:passage" may be wrong... so I've tried and search for an hour, but I can't get the answer..
sorry for bad english
my main()
on main()
  mySnippet_test()
  myTeardown()
end main
on mySnippet_test()
          tell application "Adobe InDesign CS5.5"
                    set myDocument to document 1
                    set find grep preferences to nothing
                    set change grep preferences to nothing
                    set include footnotes of find change grep options to false
                    set include hidden layers of find change grep options to false
                    set include locked layers for find of find change grep options to false
                    set include locked stories for find of find change grep options to false
                    set include master pages of find change grep options to false
                    set find what of find grep preferences to "\\n"
                    set change to of change grep preferences to "\\r"
                    set applied paragraph style of change grep preferences to "1st:passage"
                    tell myDocument
  change grep
                    end tell
  --Clear the find/change preferences after the search.
                    set find grep preferences to nothing
                    set change grep preferences to nothing
          end tell
end mySnippet_test
on myTeardown()
end myTeardown

Answer 1

Replace the red line with… Replacing name strings to yours…
set myStyle to paragraph style "Style A" of paragraph style group "Style Group 1" of myDocument
set applied paragraph style of change grep preferences to myStyle