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To extend the grep command to search for lines containing the pattern "```" followed by any word, you can use the following command:

grep -E '```[[:alnum:]]+' your_file.txt

Here's the breakdown of the command:

grep: The command itself -E: Tells grep to use extended regular expressions '[[:alnum:]]+': The pattern you're looking for : Matches the three backticks +: Matches one or more occurrences of the preceding character class your_file.txt: The file you want to search in (replace this with the actual filename) This command will match lines containing "" followed by one or more alphanumeric characters. If you want to include other characters like underscores, you can modify the character class, for example: '[_[:alnum:]]+'.