<image>The following diagram consists of squares with side length $$l$$ arranged in a certain pattern.

$$(1)$$ Observe the figure and fill in the table: 
\frac{...}
$$(2)$$ Predict the number of squares in the $$n$$-th figure and its perimeter (both expressed in algebraic form involving $$n$$).

$$(3)$$ The relationship between the perimeter $$y$$ of any figure and the number of squares $$x$$ it contains can be expressed as $$y=$$ ______ .