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2.2 instability » 7.2 instability, 6.2 instability, 2.4 instability
2c lehrbuch » 2 lehrbuch, 1 lehrbuch, zu lehrbuch
2.2 instability » 7.2 instability, 6.2 instability, 2.4 instability
2c lehrbuch » 2 lehrbuch, 1 lehrbuch, zu lehrbuch