This can be done in two opposing lines, staggered positions. You will pass through the lines each way on the forward shuffles. It can be done in two groups of lines. Do them in place.
Groups start from opposite ends of the floor, facing each other.
They are in lines both across and front to back. One side is offset so they can pass down between the dancers in the other group. Dancers proceed toward each other. When the two groups meet, they will go through each other's lines. On each shuffle pattern after the Lindys, you will pass one row of dancers.