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 ddl_statement 

<ddl_statement> ::=
  <create_table_statement>
| <drop_table_statement>
| <alter_table_statement>
| <rename_table_statement>
| <rename_column_statement>
| <exists_table_statement>
| <create_domain_statement>
| <drop_domain_statement>
| <create_sequence_statement>
| <drop_sequence_statement>
| <create_synonym_statement>
| <drop_synonym_statement>
| <rename_synonym_statement>
| <create_view_statement>
| <drop_view_statement>
| <rename_view_statement>
| <create_index_statement>
| <drop_index_statement>
| <alter_index_statement>
| <rename_index_statement>
| <comment_on_statement>
| <create_trigger_statement>
| <drop_trigger_statement>
| <create_dbproc_statement>
| <drop_dbproc_statement>

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