It is an interesting question. It's never occurred to me before. It seems when you omit the relative pronoun in nonrestrictive clause, you get an appositive.
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Kwang Hee HanWe can get rid of 'and' and 'it' and change 'said' to 'saying' there. What do you think?Yes, but lose the comma. You might also want to add an indirect object.
Kwang Hee HanI can't wait to hear from you.I'm afraid I don't understand the question. Could you please try to rephrase it and provide some examples?
Kwang Hee HanAnd I think it is possible when I have only one friend in my lifee.Could be. Few people would register that distinction, though. Here is a similar case: