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  1. en.wikipedia.org › wiki › Empty_stringEmpty string - Wikipedia

    In context-free grammars, a production rule that allows a symbol to produce the empty string is known as an ε-production, and the symbol is said to be "nullable". Use in programming languages. In most programming languages, strings are a data type. Strings are typically stored at distinct memory addresses (locations). Thus, the same string ...

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    Official website for Google search engine. Search for web content, images, videos, news, and maps. Log in for access to Gmail and Google Drive. Find Android apps using Google Play.

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  5. In the US, the minimum federal HSPF rating for all units is 7.7. To earn an ENERGY STAR label, a heat pump achieves at least 8.5 HSPF (for mini-split heat pump systems) and 8.2 HSPF (single-phase heat pumps).In short: 7.7 HSPF is the minimum. 8.5 HSPF is a good HSPF rating (earns an ENERGY STAR label).

  6. en.wikipedia.org › wiki › Han_dynastyHan dynasty - Wikipedia

    Han court officials were initially hostile to the idea of disrupting the status quo and expanding into the Xiongnu steppe territory. The surrendered Xiongnu were integrated into a parallel military and political structure under the Han Emperor, and opened the avenue for the Han dynasty to challenge the Xiongnu cavalry on the steppe.

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