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). 
Notes:
- 
 The anything call or completing the Square Thru n
    is done by the Centers only, working in the middle of the set 
    (Concentric). 
- 
 If no n or if anything is given, assume n is
    4.  Most callers nearly always supply n or anything
    so that there is no confusion. 
- 
 Several callers, myself included, call this as Mixed Up Square
    Thru, Centers go n More to clearly indicate the number of
    additional hands for the new Centers. 
| From Eight Chain Thru: 
 | 
| From Facing Lines: 
 | 
 Variations: Split Mixed Up Square Thru (But anything | n).