Another thematic introduction

*4.1.  First page in the third lecture
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Intro 'thematic' text

*Some slide text on first page in third lecture

*4.2.  Second page in third lecture
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Intro 'thematic' text

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First item on page 2 Second item on page 2

*4.3.  Third page in third lecture
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*Some slide text

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Final remarks. The material starts withChapter 1.