PREREQUISITE: Switch to print preview or a paged media view of the page.

Test passes if
a) each page in print preview (or paged media) has 3 rectangular blocks and only 3 rectangular blocks and not 2 rectangular blocks,
b) the vertical gap separating each rectangular block is uniform, identical and
c) print preview (or paged media) produces exactly 17 pages and only 17 pages: 16 pages with 3 rectangular blocks and the 17th page with 1 rectangular block.

2nd rectangular block
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49th rectangular block