sed to remove last 2 characters of txt file

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# 1  
sed to remove last 2 characters of txt file

sed 's/^..//' file1.txt > file2.txt
this will remove the first two characters of each line of a text file, what sed command will remove the last two characters? This is a similar post to my other....sry if I'm being lazy....

I need a file like this (same as last post)
>cat file1.txt

to look like this:
>cat file1.txt
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Already answered in the other thread.
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