static class GAKey {
        private final String groupId;
        private final String artifactId;
        private final int hashCode;

        GAKey(String groupId, String artifactId) {
            this.groupId = groupId;
            this.artifactId = artifactId;
            this.hashCode = Objects.hash(groupId, artifactId);
        }

        @Override
        public int hashCode() {

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>maven</groupId>
  <artifactId>p0</artifactId>
  <packaging>pom</packaging>
  <name>p0</name>
  <version>1.0</version>
  <organization>
    <name>Codehaus</name>
  </organization>

         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>test</groupId>
    <artifactId>test</artifactId>
    <version>0.1-SNAPSHOT</version>
    <packaging>pom</packaging>

    <properties>
        <my.filter.value>hello</my.filter.value>
    </properties>

    <profiles>
        <profile>

<?xml version="1.0" encoding="UTF-8"?>
<metadata>
  <groupId>org.apache.maven.its</groupId>
  <artifactId>b</artifactId>
  <version>0.1</version>
  <versioning>
    <versions>
      <version>0.1</version>
    </versions>
    <lastUpdated>20091023222817</lastUpdated>
  </versioning>

specific language governing permissions and limitations
under the License.
-->

<project>
  <parent>
    <artifactId>p0</artifactId>
    <groupId>maven.t03</groupId>
    <version>1.0</version>
  </parent>
  <modelVersion>4.0.0</modelVersion>
  <groupId>maven.t03</groupId>
  <artifactId>p1</artifactId>
  <packaging>pom</packaging>
  <name>p1</name>
  <version>1.0</version>
  <scm>
    <url>scm-url</url>
  </scm>

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>maven-test</groupId>
  <artifactId>t04-b</artifactId>
  <packaging>jar</packaging>
  <version>2.0</version>

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>maven-test</groupId>
  <artifactId>t04-c</artifactId>
  <packaging>jar</packaging>
  <version>1.0</version>

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>maven-test</groupId>
  <artifactId>t04-b</artifactId>
  <packaging>jar</packaging>
  <version>2.0</version>

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>maven-test</groupId>
  <artifactId>t05-d</artifactId>
  <packaging>jar</packaging>
  <version>1.0</version>

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>maven-test</groupId>
  <artifactId>t05-d</artifactId>
  <packaging>jar</packaging>
  <version>1.2</version>