The company recently signed an amendment to the proposed restructuring support agreement, which has support from 85.4% of certain noteholders. Submission is envisaged by 9 December but there was no guarantee a final agreement would be reached, Stone said.

"There can be no assurance that we will be successful in completing a restructuring or any other similar transaction on the terms set forth in the RSA and the RSA Amendment, on different terms or at all," the company said.

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