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Formel zum Bild "Jo-Jo-Trio von Hermann Bauer": [x^2+y^2-1 +8z^4-8z^2+1^]*[y^2+z^2-1 +8x^4-8x^2+1^]*[z^2+x^2-1 +8y^4-8y^2+1^] = 0