I forgot what I really wanted to say in the last message !!!!!! Strangely, I think that the Lyrics of "the happiest days of our lives" are essential to understand "another brick in the wall (part 2)". It really adds to the striking effects of the lyrics of the 2nd song. "The happiest..." seems to show the causes and "another brick..." , the consequences. Maybe I mistake.

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United we stand, divided we fall.