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diff --git a/src/main/java/org/apache/commons/math3/geometry/partitioning/Side.java b/src/main/java/org/apache/commons/math3/geometry/partitioning/Side.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.math3.geometry.partitioning;
+
+/** Enumerate representing the location of an element with respect to an
+ * {@link Hyperplane hyperplane} of a space.
+ * @since 3.0
+ */
+public enum Side {
+
+    /** Code for the plus side of the hyperplane. */
+    PLUS,
+
+    /** Code for the minus side of the hyperplane. */
+    MINUS,
+
+    /** Code for elements crossing the hyperplane from plus to minus side. */
+    BOTH,
+
+    /** Code for the hyperplane itself. */
+    HYPER;
+
+}