Add Elefant results for Case2a

[yingyil06]

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Describe what you did in this PR and why you did it.

Before your first pull request:

• I have read the guidelines in our CONTRIBUTING.md document.

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• I have followed the instructions for indenting my code.

For new features/models or changes of existing features:

• I have tested my new feature locally to ensure it is correct.
• I have created a testcase for the new feature/benchmark in the tests/ directory.
• I have added a changelog entry in the doc/modules/changes directory that will inform other users of my change.

[yingyil06]

A folder named "Elefant" containing the Elefants results for Case2a is uploaded