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Objetive-C sintax

Hi to everybody!!!
Could anyone of the gurus of this mailing list explain my this line of code:
NSString *stringFinal = [NSString stringWithFormat:@"%@ tiene %d letras",
[gEntradaDeTexto stringValue],
[stringDeEntrada length]];
More expecific, I don't understan why need introduce the class name in the first part of de method call. I define a pointer to a variable of NSString type and named -stringFinal- but when I make the method call I need use NSString in the begining of the call, why?
Thank you very much in advance.
Best regards from Spain.
JuanC++
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