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lesson 'A theater group made appearances in two cities' in section 'Linear-systems'
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lesson 'Determine the type of a triangle' in section 'Geometry_Word_Problems'
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lesson 'Two parallel chords in intersecting circles' in section 'Geometry_Word_Problems'
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lesson 'Miscellaneous word problems for the day of April, 1' in section 'Miscellaneous_Word_Problems'
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lesson 'Non-standard Trigonometry problems' in section 'Trigonometry-basics'
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lesson 'distance' in section 'Length-and-distance'
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lesson 'A child is running on a moving sidewalk in an airport' in section 'Travel_Word_Problems'
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lesson 'Climbing a coconut tree up and down' in section 'Travel_Word_Problems'
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lesson 'Miles per gallon effectiveness and moving car' in section 'Travel_Word_Problems'
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lesson 'Unusual catching-up problem' in section 'Travel_Word_Problems'
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lesson 'HOW TO algebreze and to solve these non-traditional Travel and Distance problems' in section 'Travel_Word_Problems'
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lesson 'OVERVIEW of additional lessons on Travel and Distance' in section 'Travel_Word_Problems'
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lesson 'Two circles tangent externally and touching a given straight line' in section 'Geometry_Word_Problems'
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lesson 'Advanced probability problems from the archive' in section 'Probability-and-statistics'
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lesson 'Miscellaneous problems on permutations, combinations and other combinatoric entities' in section 'Permutations'
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lesson 'Probability for a computer to be damaged by viruses' in section 'Probability-and-statistics'
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lesson 'Challenging word problems solved using quadratic equations' in section 'Quadratic_Equations'
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lesson 'Typical probability problems from the archive' in section 'Probability-and-statistics'
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lesson 'Geometric probability problems' in section 'Probability-and-statistics'
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lesson 'Challenging probability problems' in section 'Probability-and-statistics'
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