You may use boolean searches as well:

Place a + in front of a word to require it, - to exclude it
" Double quotes around a phrase, matches only conceptions containing the complete phrase.
~ A leading tilde marks a word as less important. It's useful for marking noise words.
* An asterisk acts like a wildcard. Unlike the others it is placed AFTER the word and not before it.
( ) Parentheses are put around sub-expressions to give them higher precedence in the search.

For example you can search for:

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