The correct answer is 1234.
The blocks are joined by a sliding process called wringing, which causes their ultra-flat surfaces to cling together.
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The missing word here is social.
Social engineering involves using simple human methods to steal data, such as looking through peoples’ drawers for pieces of paper on which they might have written down passwords, or perhaps sneaking a look at the keys you press while walking past your desk as you are typing your password. Such behaviors designed to steal your personal information are methods of social engineering.
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