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(2-1) The nine dot problem.
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(2-2) Solution to Duncker’s tumour problem.
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(2-3) A solution to the nine dot problem.
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(2-4) Wertheimer’s area of a parallelogram problem.
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(3-1) A standard abstract version of the Wason selection task.
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(3-2) A realistic version of the Wason selection task.
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(3-3) Alternative causal models relating three variables.
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(4-1) Example of a decision tree.
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(5-1) Alternative models for the same syllogism.
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(5-2) Representation of the medical diagnosis problem.
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(5-3) Representation of the cabs problem.
