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If you've been linked to this, you probably made a language mistake and whoever sent this to you cared enough to point it out. The best thing to do is read the details and see where you went wrong.
The proper form is "a couple of X", as in "a couple of things". Often this is not heard in casual speech.
Additional Note: "A couple more" and "a couple fewer" are correct, since "a couple" represents the amount of difference, which does not require "of".
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