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1] FILETYPE

IT IS ONE OF THE DROCKS WHICH PROVIDES INFORMATION OF THE SEARCH WITH THE FILE TYPE YOU MENTIONED.

FOR EX -> filetype:pdf "hacking"

2] SITE

THIS DROCK PROVIDES INFORMATION YOU WISH TO SEE IN A PARTICULAR SITE

FOR EX -> hacking info site: www.google.com

3] ALLINTITLE

IT GREAPS THE PERTICULAR WORD

FOR EX -> allintitle: index of avengers