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<li>'''''- (NSUInteger)length'''''</li>
<span style="color:#6600FF;">NSString</span> *nsstring = [<span style="color:#6600FF;">NSString</span> <span style="color:#660099;">initWithFormat</span>:<span style="color:#CC0000;">@"Open %sSource!"</span>, <span style="color:#CC0000;">@"Source"</span>];
<span style="color:#6600FF;">NSUInteger</span> *length;
<li>'''''- (NSString *)stringByAppendingString:(NSString *)that'''''</li>
<span style="color:#6600FF;">NSString</span> *nsstring1 = [<span style="color:#6600FF;">NSString</span> <span style="color:#660099;">initWithFormat</span>:<span style="color:#CC0000;">@"Open"</span>]; <span style="color:#6600FF;">NSString</span> *nsstring2 = [<span style="color:#6600FF;">NSString</span> <span style="color:#660099;">initWithFormat</span>:<span style="color:#CC0000;">@"Source!"</span>];
<span style="color:#6600FF;">NSString</span> *nsnewstring;