The First Two (#1 and #2) end as a Couple with each other; and
the Last Two (#3 and #4) end as a Couple with each other.
The lead dancer of each Tandem (#1 and #3) end as Ends,
and the trailing dancer of each Tandem (#2 and #4) end as Centers
in the resulting lines. As such,
it's important to establish your couple-relationship as soon as possible.
EN: 60