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Error Correction Spiral
U: Give me the price for AT&T.
S: Hewlett-Packard was 83 ¾, up 2 ½ since yesterday.
U: Give me the price for AT&T.
S: Data General was at 10 ½ up a quarter.
U: Give me the price for AT&T.
S: Hewlett-Packard was 83 ¾, up 2 ½.
U: Give me the price for American Telephone and Telegraph.
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