From an Eight Chain Thru, Facing Lines, or other applicable formations.
Square Thru until the original Centers become Ends of Back-To-Back Lines and until the original Outsides become Centers of Facing Lines; New Centers (working in the middle) do the anything call or complete the Square Thru n (continuing with alternating hands).
Noter:
Fra Eight Chain Thru:
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Fra Facing Lines:
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Variationer: Split Mixed Up Square Thru (But anything | n).