An output stream for writing the lexicon to a file sequentially.
We would begin at the root node, and then begin sequentially scanning the keys stored within.
Other line dances such as the Continental Walk and the Bus Stop were basically versions of the original Hustle but with the dancers turning to repeat steps in four different directions sequentially.
The first card is turned up, then sequentially in separate piles, cards are turned face town in columns of one through six.