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There are four different versions of Spread (only the first two are used at Plus):
- From Columns: Centers spread apart as ends move in.
- From a Line: Ends and adjacent Centers exchange places 
  by sidestepping into each other's position.  
  - If adjacent dancers are in a Mini-Wave, slide nose-to-nose;
- If adjacent dancers are a Couple, do a Half Sashay 
(Belle slides in front of Beau).
 
- Designated dancers Spread (e.g., from Columns: Ends Spread, check a Butterfly)
- The call Wheel & Spread.  
  From a One-Faced Line.  Wheel & Deal;
  Leaders sidestep apart from one another (and backup slightly) as Trailers move in between.
| From Columns: 
 |   |  |   |  | before Spread
 |  | after 
 | 
 | From a Line: 
 |   |  |   |  | before Spread
 |  | after 
 | 
 | 
| From a "Z": 
 |   |  |   |  | before Spread
 |  | after 
 | 
 | From a Diamond: 
 |   |  |   |  | before Spread
 |  | after 
 | 
 | 
| Girls Trade & Spread: 
 |   |  |   |  | before Girls Trade & Spread
 |  | after 
 | 
 | Designated Dancers Spread: 
 This instance of Spread is usually|   |  |   |  | before Boys Spread
 |  | after 
 | 
only used at C1 and above.
 | 
| Wheel & Spread [C4]: 
 Wheel & Spread, the basis for Spread, was once on the Plus list. Today, Wheel & Spread is no longer considered legal at Plus. | 
Diagram from T-Bone Lines.  (e.g., Generalized Lines after Centers CR1)
Diagram from a Thar.
Diagram from a Wave Of 6.
Diagram from 8ChTh after Outsides Single Shuffle.
Notes:
- 
Nobody changes their facing direction on a Spread.
- 
Spread is usually used as a suffix to another call
  (e.g., Follow Your Neighbor & Spread).
- 
Because there are different versions of Spread, sometimes there is an ambiguity.
  For instance, from R-H Columns: Centers Trade & Spread.  Do the Centers
  Trade then all Spread, or do the Centers Trade then Centers only Spread?
  The caller should use helper words to disambiguate.
- 
From Back-to-Back Lines, Wheel & Deal & Spread is the same 
  as Wheel & Spread.  However, from a Tidal setup (e.g., from an 
  As Couples Two-Faced Line), they are quite different.
Is it okay for someone to backup for a Spread?  (e.g., from Trade By?)
Calls commonly used at Plus that can be followed by Spread:
           
Slide [A2] (Lee Kopman 1966):
 From a Wave or other applicable 4-dancer formation.
  Ends and adjacent Centers slide nose-to-nose past one another to exchange places.
Slim Down [C4]:
 From any 2 x 4 or other applicable formation.
  Without turning, Centers move one position toward the nearest
  unoccupied outside position as Outsides move one position toward the center.
  Everyone does either a sidestep right, sidestep left, step forward, or step backward.
  From Columns, Slim Down is the same as Spread.