Rewrite about the first 1/10th of ch09. Remove information that isn't false. Add a few code examples that have actually been tested. Add some much-needed clarifications. Warn people to really seriously use PIR instead
Rewrite about the first 1/10th of ch09. Remove information that isn't false. Add a few code examples that have actually been tested. Add some much-needed clarifications. Warn people to really seriously use PIR instead

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@38188 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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