您还记得这样的字谜么——每次只允许修改单词的一个字母，就能把它变换成另外一个单词？

Remember those puzzles where you had to transform one word into another while changing only one letter at a time?

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第二项测试更加复杂，要求所有受试者浏览由20个字母组成的若干字母串，并且对变换的字母立即做出反应。

The next test was more complex, requiring all to scan sequences of 20 identical letters and respond the instant one of the letters transformed into a different one.

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通过将数据的某些部分进行组合来压缩数据，例如，通过将一些字母的数字等值相加，可把两个字长的字母键词变换为一个字长的数字键词。

To compact data by combining parts of the data, for example, to transform a two-word alphabetic key into a one-word numeric key by adding the numeric equivalents of the letters.

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