Ends Split Circulate twice as Out-facing Centers Crossover Circulate and Circulate as In-facing Centers Circulate and Crossover Circulate.
Ends in a 2 x 4.
Drift Apart is a 2-part call.
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 From Parallel Waves: 
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 From Columns: 
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Note: From Parallel Waves or Two-Faced Lines, Drift Apart is equivalent to Tandem Cross Roll To A Line | Wave (except that not all dancers can Roll on a Drift Apart).
Crossover Circulate [A1] :
 From a Generalized 2 x 4, Generalized Thar, or other applicable formations.  
  As one movement, Circulate & Half Sashay.