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Summary of Significant Accounting Policies - Exchange rates (Details) | 6 Months Ended | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Euro to US Dollar |  |  |  |
Period end exchange rate | 1.13 | 1.23 | 1.19 | 1.12
Average period exchange rate | 1.17 | 1.17 | 1.19 | 1.11
Mexican Peso to US Dollar |  |  |  |
Period end exchange rate | 0.05 | 0.05 | 0.05 | 0.04
Average period exchange rate | 0.05 | 0.05 | 0.05 | 0.05

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