. 6.6. , (1974)
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1977 (Roger Schank; Robert P. Abelson) .
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(frame (name (Cube))
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(height (IF-DEFAULT (use length))))
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(isa (Cube))
(color (red))
(length (80)))
(frame (name (B2))
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(color (green))
(length (65))
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isa , B1 B2 Cube , , length = width = height.
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