Research V7 development

Work on file usr/doc/learn/p7

Co-Authored-By: Michael E. Lesk <mel@research.uucp>
Synthesized-from: v7

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+.NH
+Acknowledgments
+.PP
+We are grateful to all those who have tried
+.ul
+learn,
+for we have benefited greatly from their
+suggestions and criticisms.
+In particular,
+M. E. Bittrich,
+J. L. Blue,
+S. I. Feldman,
+P. A. Fox,
+and
+M. J. McAlpin
+have provided substantial feedback.
+Conversations with E. Z. Rothkopf also provided many of the ideas in the system.
+We are also indebted to Don Jackowski
+for serving as a guinea pig for the second version,
+and to Tom Plum for his efforts to improve the C script.
+....SG \s-2MH\s0-1273/4-\s-2MEL/BWK\s0-unix
+.[
+$LIST$
+.]