Identify the next elements in the following visual patterns:

Here are the solutions for the patterns:

6. More Examples: What comes next? a) The pattern is two triangles followed by two squares, repeating. The given sequence is $\triangle, \triangle, \square, \square, \triangle, \triangle, \square, \square, \dots$ The next shapes in the pattern will be two triangles. Answer: $\boxed{\triangle \triangle}$

   b) The pattern consists of three repeating shapes: a diagonal line, horizontal lines, and vertical lines.
   The given sequence is $\diagdown, \equiv, \parallel, \diagdown, \equiv, \parallel, \dots$
   The next shape in the pattern will be the diagonal line.
   Answer: $\boxed{\diagdown}$