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I first got the taste for ''linked text'' long before the advent of interned and hypertext.
In those days there were printed versions of this, called ''Programmed Text'' (also referred to as ''Basically Branching''). One of the most accomplished trademarks was ''TutorText''.
Three substantial volumes of these in Precalculus Mathematics (Algebra, Trigonometry, Functions And Relations) did for me what two years at the Open University failed to do...
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