diff --git a/prepare/src/main/guessNNprepare/Utils.scala b/prepare/src/main/guessNNprepare/Utils.scala
index 37d4d21..4ef3c3f 100644
--- a/prepare/src/main/guessNNprepare/Utils.scala
+++ b/prepare/src/main/guessNNprepare/Utils.scala
@@ -2,8 +2,9 @@ package guessNNprepare
 
 import org.apache.jena.rdf.model.{InfModel, ModelFactory}
 import org.apache.jena.reasoner.ReasonerRegistry
-import org.json.JSONArray
+import org.json.{JSONArray, JSONObject}
 
+import java.io.FileWriter
 import java.util.stream.StreamSupport
 import scala.jdk.StreamConverters.StreamHasToScala
 import scala.util.{Failure, Success, Try}
@@ -34,4 +35,21 @@ object Utils {
 		case Nil => Success(Nil)
 	}
 
+	sealed trait JSONObjectOrArray[T]
+
+	implicit object JSONObjectImplicit extends JSONObjectOrArray[JSONObject]
+
+	implicit object JSONArrayImplicit extends JSONObjectOrArray[JSONArray]
+
+	def writeJsonToFile[T: JSONObjectOrArray](json: T, path: String): Unit = {
+		val writer = new FileWriter(path)
+		json match {
+			case value: JSONObject => value.write(writer)
+			case value: JSONArray => value.write(writer)
+		}
+		writer.flush()
+		writer.close()
+	}
+
+
 }
diff --git a/prepare/src/main/guessNNprepare/mains/ComputeConcepts.scala b/prepare/src/main/guessNNprepare/mains/ComputeConcepts.scala
index e3f18d4..42215a9 100644
--- a/prepare/src/main/guessNNprepare/mains/ComputeConcepts.scala
+++ b/prepare/src/main/guessNNprepare/mains/ComputeConcepts.scala
@@ -29,7 +29,7 @@ object ComputeConcepts extends MainCommand {
 		// CLI args
 		val entitiesFilePath = Paths.get(ARGS.getString("guessable_entities"))
 		val guessTarget = ARGS.getString("target")
-		val outputFilePath = Paths.get(ARGS.getString("json_output"))
+		val outputFilePath = ARGS.getString("json_output")
 
 		println(s"Loading entities from ${entitiesFilePath}")
 		val entities: List[NamedEntity] = loadEntitiesOrFail(entitiesFilePath)
@@ -59,10 +59,11 @@ object ComputeConcepts extends MainCommand {
 		partitionThread.join(60000)
 		stop.set(true)
 		partitionThread.join()
-		println(s"Concept computation finished, ${(System.currentTimeMillis() - startTime)/1000}s elapsed.")
-		Files.writeString(outputFilePath, cnnPartition.toJson)
-
-
+		println(s"Concept computation finished, ${(System.currentTimeMillis() - startTime) / 1000}s elapsed.")
+		// The only way to programmatically get the output of the CNN algorithm is to parse its json
+		val output = cnnJsonToOutputJson(new JSONObject(new JSONTokener(cnnPartition.toJson)), entities.size)
+		println(s"Writing output to ${outputFilePath}")
+		Utils.writeJsonToFile(output, outputFilePath)
 	}
 
 	private def loadEntitiesOrFail(jsonFilePath: Path): List[NamedEntity] = {
@@ -80,4 +81,26 @@ object ComputeConcepts extends MainCommand {
 			})
 			.get
 	}
+
+	private def cnnJsonToOutputJson(cnnJson: JSONObject, nbEntities: Int): JSONObject = {
+		val result = new JSONObject()
+		result.put("target", cnnJson.getJSONArray("target").get(0))
+		result.put("nbEntities", nbEntities)
+		result.put("concepts", new JSONArray(
+			Utils.JSONArrayElementsAs[JSONObject](cnnJson.getJSONArray("conceptsOfNeighbours"))
+				.map(processConcept)
+				.asJava
+		))
+		result
+	}
+
+	private def processConcept(concept: JSONObject): JSONObject = {
+		val result = new JSONObject()
+		result.put("extensionalDistance", concept.getInt("extensionalDistance"))
+		val objects: Seq[JSONObject] = Utils.JSONArrayElementsAs(concept.getJSONArray("answers"))
+		result.put("properSize", objects.size)
+		result.put("elements", new JSONArray(objects.asJava))
+
+		result
+	}
 }
diff --git a/prepare/src/main/guessNNprepare/mains/ExtractEntities.scala b/prepare/src/main/guessNNprepare/mains/ExtractEntities.scala
index ab9bc15..79d1863 100644
--- a/prepare/src/main/guessNNprepare/mains/ExtractEntities.scala
+++ b/prepare/src/main/guessNNprepare/mains/ExtractEntities.scala
@@ -4,12 +4,9 @@ import guessNNprepare.{NamedEntity, Utils}
 import net.sourceforge.argparse4j.impl.Arguments
 import net.sourceforge.argparse4j.inf.{ArgumentParser, Namespace}
 import org.apache.jena.query.QueryExecutionFactory
-import org.apache.jena.rdf.model.{InfModel, Model, ModelFactory}
-import org.apache.jena.reasoner.ReasonerRegistry
+import org.apache.jena.rdf.model.Model
 import org.json.JSONArray
 
-import java.io.{FileWriter, InputStream}
-
 object ExtractEntities extends MainCommand {
 
 	override def description: String = "Save the list of guessable entities to a json file"
@@ -37,10 +34,7 @@ object ExtractEntities extends MainCommand {
 		println(s"Writing entities to ${jsonFilePath}")
 		val jsonEntities:JSONArray = new JSONArray()
 		guessableEntities.foreach(e => jsonEntities.put(e.json))
-		val writer = new FileWriter(jsonFilePath)
-		jsonEntities.write(writer)
-		writer.flush()
-		writer.close()
+		Utils.writeJsonToFile(jsonEntities, jsonFilePath)
 
 		println("Done.")
 	}