'Semi-first-name basis' (if anyone uses it) would mean that the relationship is not quite a familiar one yet. First names are sometimes used, and sometimes more formal names.
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Sandy Ho 1) we know each other well enough that we call their sime-first-name,for example.
calling Rachel Green as Rach shows we are so close.
2) we are just on the half way to become a "first name basis" relationship.
that means we are not that much close. Hi.
"Semi-" in this case does not mean "a semi-name," a