Once a problem is recognized, relevant information from long-term memory is used to determine if a satisfactory solution is known, what the characteristics of potential solutions are, what the appropriate ways to compare solutions are, and so forth. This is referred to as

in an effort to stem the tide of refugees attempting to leave east berlin, the communist government of east germany begins building the berlin wall to divide east and west berlin. construction of the wall caused a short-term crisis in u.s.-soviet bloc relations, and the wall itself came to symbolize the cold war.

can you explain it better

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you should think about the answers you give and expect the same form your questions.