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Card 6

Front

Helmholtz

Back

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Card 7

Front

Hadamard

Back

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Card 8

Front

Silveira (1971)

Back

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Card 9

Front

Murray and Denny (1969)

Back

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Card 10

Front

Duncker (1945)

Back

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Card 11

Front

Luchins (1942)

Back

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Card 12

Front

Scheerer (1963)

Back

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Card 13

Front

Weisberg and Alba (1981)

Back

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Card 14

Front

Brown and McNeill (1966)

Back

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Card 15

Front

Metcalfe (1986)

Back

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