{HEAD ~ Suitable electronically conductive materials} include {TAIL ~ graphite}, carbon, nickel powder, nickel plated steel, and other materials stable in the range of potential encountered, and mixtures thereof 
include
{ HEAD ~ Suitable electronically conductive materials } include { TAIL ~ graphite } , carbon , nickel powder , nickel plated steel , and other materials stable in the range of potential encountered , and mixtures thereof
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