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Zipper formation

I've asked a few people this question and I get different answers. Therefore, I am obviously asking you to get the definitive answer. The question is:

In a zipper formation, are the dancers in a two by eight formation or are they in merely a distorted tidal wave?

A Zipper is a 2xN formation consisting of N dancers and N phantom positions, in which there are no adjacent dancers (i.e., for each dancer within the 2xN matrix, each adjacent position is not occupied by a another dancer).

Hence, a Zipper looks like dancers occupying all the dark spaces from two rows of a chessboard.

A Zipper can easily be created from a 1xN Wave by having everyone 1/2 Press Ahead (or 1/2 Press Back).

X - X - X - X -
- X - X - X - X

Dancers may be facing any direction within the formation. Hence, a Zipper is only a Distorted Tidal Wave if the caller so indicates.