I think that that test that so many of us fail "Three columns? I can only see two" is designed to test if you have binocular vision. The trouble is, I don't believe that drivers are required to have binocular vision in order to get a license otherwise people with only one eye (Canterbury supporters excluded) would never be allowed to drive.
Makes you wonder why they continue to fail people on that part of the test really doesn't it. I wonder if the Opticians professional body "greased a few palms" so to speak.
"There must be a one-to-one correspondence between left and right parentheses, with each left parenthesis to the left of its corresponding right parenthesis."
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