" The "one" is only replacing "doormat". The pronoun 'one' replaces 'a doormat'. Here are some ripe bananas .
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Debpriya DeIf it is a pronoun, then why can't we say "I think I'll buy a one", when we can say "I think I'll buy a doormat." The "one" is only replacing "doormat".The pronoun 'one' replaces 'a doormat'.