alternate with sth

alternate with something
1. [for someone] to serve as a substitute for someone.
  I alternated with Fred as the lead in the school play.
  They asked Harry to alternate with Ron on the team.
2. [for something] to appear repetitively and regularly in a sequence with something else. (For instance, A alternates with B in the sequence ABABAB.)
  In this design the straight lines alternate with the circles.
  The red dots alternate with the blue ones.

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