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I

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• The course covers three years.

• The laboratory course extends over the first two years.

• Each pulse lasts for 5x10^-9 second.

II

• These investigations are being continued.

• Although this study is (still) in progress, the experimental results appear to be sufficiently significant to ...

• After use, the gas flow persists long enough to allow ...

• The volcanic activity here began in the Eocene and (still) persists today.

• Production of sediment and sedimentary rock has gone on throughout the past years.