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https://books.google.com/books?id=jM-cBAAAQBAJ&pg=PA115&lpg=PA115&dq=%22making+it+possible+for+the+programmer+to+focus+on+a+manageable+subset%22&source=bl&ots=yrJ3a-Tvi6&sig=XZwYoWwbQxP2w5qh2k2uMAPj47k&hl=en&sa=X&ved=0ahUKEwjKr-Ty35DSAhUJ4mMKHbPrAUUQ6AEIIzAA#v=onepage&q=%22making%20it%20possible%20for%20the%20programmer%20to%20focus%20on%20a%20manageable%20subset%22&f=false