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<br><div><html>On Mar 27, 2008, at 10:04 PM, Cooke Kelsey wrote:</html><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: 'Lucida Grande'; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div>Hi, I think I see what you are driving at. </div></span></blockquote>... <br><blockquote type="cite" class=""><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><font face="Lucida Grande" size="3" style="font: 12.0px Lucida Grande">the words are missing the letter A, the first of the current (****) word</font></div></blockquote>... <br><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: 'Lucida Grande'; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div> <span class="Apple-style-span" style="color: rgb(0, 0, 221); -webkit-text-stroke-width: -1; ">I thought of your reminder to use helper functions, e.g. "add-prefix," but I keep going back to this register idea. I don't know whether I am getting off track or what.</span></div></span></blockquote><br></div><div>What would "add-prefix" do? "Register" sounds like an old man's way of thinking about machines and lower-level representations of computations yet. But add-prefix seems definitely related to the "it's missing the letter ..." part. </div><div><br></div><div>Where should this missing letter get added in the result of <span class="Apple-style-span" style="color: rgb(0, 31, 212); ">(insert-in-single-word s (rest word))? Correct! At the beginning. </span></div><div><font class="Apple-style-span" color="#001FD4"><br></font></div><div><font class="Apple-style-span" color="#001FD4">Keep going. -- Matthias</font></div><div><font class="Apple-style-span" color="#001FD4"><br></font></div><br></body></html>