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Revision Notes:
1. The earliest generally available version of Lesson 7 is typewritten. It bears the handwritten date of (Monday), June 2, 1969.
2. The earliest available version of Lesson 7 had a slightly different paragraph break. What was originally the last sentence of paragraph two, "Look at a cup, for example," is the first sentence of paragraph 3 in the published version.
The last sentence of Lesson 7, "Three or four practice periods, each to last a minute or so, will be enough," was not part of the earliest available typewritten version.
It is not known when, or by whom, these changes were made before the 1975 version was published.
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