Fin vs. Final


Please:  Can someone explain the difference between fin final.  
Sentence examples:
     No, una cuadra, de allí, al fin de la calle están.
     Al final de la calle, allí están.
     Al final de la calle.

Why use fin at all in the first example, especially since it's used in identical phrases?  Also, they are all used as nouns.
Gracias por aydarme,


al fin  =  at last
Al final  = at the end
referenced from

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