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I'm doing the exercise on p. 36 of 'Squeak by Example'. I get the message <BR>
openinWorld<BR>&nbsp;self shouldBeImplemented<BR>
&nbsp;<BR>
MessageNotUnderstood: SBECell&gt;&gt;openinWorld<BR>
shouldBeImplemented<BR>
<BR>What's the problem?<BR>                                               </body>
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