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  / ___//  /_   _//     ___     / _ \\  |      \\ 
  \___ \\   -| ||-     /   ||  / //\ \\ |  --  // 
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`-----`    `-----`      -|_|| `-`   `-` `------`  
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Text this: Experimental development of fabry-perot fiber-optic metal ion sensor based on layer-by-layer (chitosan/polystyrene sulfonate) substrate and ionophore (carboxymethyl 18-crown-6).