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In phonology , the most prominent distinguishing element of Peninsular Spanish varieties , except for the southernmost ones , is the preservation of a distinction between the phonemes and , represented respectively with the letters ⟨ s ⟩ on one hand and ⟨ z ⟩ , or ⟨ c ⟩ before ⟨ e / i ⟩ , on the other .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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