Relative clauses of which the predicate contains a present, past, or passive participle can be used in a reduced form. "Of which" is fine: "the predicate of relative clauses ". "Of" is used here to indicate that "the predicate relates to/is part of relative clauses".
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Relative clauses of which the predicate contains a present, past, or passive participle can be used in a reduced form.
"Of which" is fine: "the predicate of relative clauses".
"Of" is used here to indicate that "the predicate relates to/is part of relative clauses".