for (int i = 0; i < someLargeNumber; i++) {
  NSString *string = ...;
  string = [string lowercaseString];
  string = [string stringByAppendingString:...];
  NSLog(@“%@”, string);
}

for (int i = 0; i < someLargeNumber; i++) {
  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];


  NSString *string = ...;
  string = [string lowercaseString];
  string = [string stringByAppendingString:...];
  NSLog(@“%@”, string);


  [pool release];
}

NSString *stringToReturn = nil;

for (int i = 0; i < someLargeNumber; i++) {
  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
  NSString *string = ...;
  string = [string stringByAppendingString:...];
  if ([string someCondition]) {
    stringToReturn = [string retain];
  }


  [pool release];
  if (stringToReturn) break;
}
return [stringToReturn autorelease];