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Summary of significant accounting policies (Details)	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Summary of Significant Accounting Policies [Abstract]
Annual price variation	56.00%	29.00%	19.00%
Cumulative as of June 30, 2019 (3 years)	139.00%

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- Definition

Annual price variation.

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No definition available.

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- Definition

Cumulative annual price variation.

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No definition available.

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- References

No definition available.

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