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Angles of Friction (8-16)       | 
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Wedges (8-17)       | 
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Example (8-18)       | 
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Example (8-19)       | 
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Example (8-20)       | 
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Example (8-21)       | 
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Example (8-22)       | 
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Example (8-23)       | 
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Example (8-24)       | 
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