Related papers: G2 manifolds of cohomogeneity two

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This paper has been withdrawn, because its material has been revised and became part of paper math.GT/0010184

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This paper has been withdrawn by the author due to a crucial error in equation (51).

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This paper has been withdrawn by the authors due to a crucial error in equation 12.

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This paper has been withdrawn by the authors due to some errors.

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This paper has been withdrawn by the author due to the unsure solutions to the Dyson-Schwinger equation.