How do I translate this Cypher query to OrientDB SQL

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Having the following cypher query:

 MERGE (r:Root)
 MERGE (r)<-[:N]-(n1:T {id: \'a\'})
 SET n1.description = \'d1\'
 WITH r,n1
 MERGE (n1)<-[:N]-(n2:T {id:


                      
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