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https://web.archive.org/web/20211104164847/https://mitpress.mit.edu/sites/default/files/sicp/full-text/sicp/book/node6.html
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https://web.archive.org/web/20211103210330/https://mitpress.mit.edu/sites/default/files/sicp/full-text/sicp/book/node10.html
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SICP Section 1.1
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https://web.archive.org/web/20110429185745/https://mitpress.mit.edu/sicp/full-text/book/book-Z-H-10.html#%25_sec_1.1.7
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Hoogle
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(X_->_Bool)_->_(X_->_x)_->_x_->_x
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Prelude
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https://web.archive.org/web/20070319202251/http://www.cs.bham.ac.uk/~ard/modules/swh05.html
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https://web.archive.org/web/20211105092005/https://mitpress.mit.edu/sites/default/files/sicp/full-text/sicp/book/node13.html
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SICP Chapter 1.2 notes
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