From Parallel Lines with the Ends Back-to-Back, or other applicable formations.

Ends Cross Fold and Roll as Centers (Concentric) 1/4 Out and Trade.

Parallel Lines end in Facing Lines. This is a 2-part call.

Trip The Set 之前   Ends Cross Fold 同时 Centers 1/4 Out 之后 (1/2)   Ends Roll 同时 Centers Trade 之后 (完成)