From a Tidal Wave, Facing Lines, or other applicable formations.
Arm Turn 1/2; 
  Centers of each side Cast Off 3/4 and Spread as Very Centers Trade;
  Very Ends and Very Centers slide together and Cast Off 3/4.
Ends in Parallel Lines.
| |   |  |   |  |   |  |   |  | before Spin Chain The Line
 |  | after Arm Turn 1/2
 |  | after Centers of each side
 Cast Off 3/4 and Spread
 as Very Centers Trade
 |  | after Very Ends and Very Centers
 Slide together & Cast Off 3/4
 (done)
 | 
 | 
Notes:
- 
The Very Ends and Very Centers should wait until the Centers of each
    side have completed the call before sliding together for the final Cast
    Off 3/4.
- 
The most common dancer mistake we see is that the dancers who become
    the Very Ends after the initial Arm Turn 1/2 start wandering.  If
    you become one of the Very Ends, stay in place and wait for a few beats
    until you are met by one of the Very Centers for the final Cast Off 3/4.
    Sometimes the hardest part of a call is waiting for  something to happen.
Spin Chain The Line But anything [C3AV]:
 Resulting Centers replace the final Cast Off 3/4 with the anything call.
Fan Chain The Line [C3B]:
 From a Tidal Line or Facing Lines (in which case dancers first step to a R-H Tidal Wave).  
  Centers of each side Cast Off 3/4
  and Spread as Very Centers Trade; Very Ends and Very Centers Slide together and Cast Off 3/4.
  Ends in Parallel Lines.