It's not clear what you're trying to say. 1 is certainly not right. 2.
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BarbaraPA1 is incorrect because "fewer" is use with countable nouns. I have fewer bananas than you do.You don't have "a fewer relationship."You can have "less of a relationship."Thanks then what about this sentence?
BarbaraPAThen say "The X methodology is insufficient to cover special test cases."Thanks babarapa