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A famous artificial intelligence program devised in 1968–70 by the computer scientist Terry (Allen) Winograd (born 1946) to carry out instructions in a block world—a table with blocks of various shapes and colours scattered over it. On the basis of images from a video camera scanning the scene, the program works out the arrangement of blocks, some of which may be lying on top of others, responds to questions in English about the situation, replies to these questions in English, understands requests in English to manipulate the blocks, carries out such requests with a robotic arm, and describes in English its actions and the reasons behind them. [Named after the printer's code ETAOIN SHRDLU used to indicate typographical errors, representing the twelve most frequent letters in English in descending order]

Subjects: Psychology.

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