Crossword Help Forum
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December puzzle:

http://drive.google.com/file/d/0B-WQdeO9wXEHclZZUXFQOUhTQnM/view?usp=sharing

November solution:

http://drive.google.com/file/d/0B-WQdeO9wXEHWTFhWW5KZnN1ZG8/view?usp=sharing

For best results, please download, open, then print.

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Previous puzzles & threads can be found here:

2016: http://tinyurl.com/h2zduy4

2015: http://tinyurl.com/oynnjsx

2014: http://tinyurl.com/o6g6w4u

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That was a blast. Thanks, syzzie.

As usual, having spent at least three hours on this, I am less than half way and can make no sense of the "replacements" whatsoever. I am getting real mad at 12 dn, having solved the clue!

Think homophones, or, as Jeeves might say, "Close."

It was the crossing U in 10d that clued me in.

10 dn has me stumped- though I know (now!!!) Carnegie Mellon is a univeristy. Does it begin with a "Y" ??
I really, really don't like homophones! Am trying (as you all know!)

Grammatical error is the definition. Begins with S. Carnegie Mellon is CM.

Thanks aristo. Working on it.

A word of warning: two of the altered entries don't change the original letter count (I think that should have been pointed out by the setter), and one of these I had to search for and change, because it's a non-crossing letter that alters it.

Ah. I did wonder about 12 dn, which is still 13, and 5dn which is still 12. i think the preamble is misleading here.
I like 28 ac!