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This helper template calculates periods for Hong Kong certifications, as stated in the following source:
- [1] - certification until 2006
- [2] - certification from October 2007
- [3] current certification. [4] showing it was active on Jan 2008, [5] showing it wasn't on Dec 2007, so change occurred Jan 2008.
There is no data for the interim period
It returns:
| Before 2006
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Before October 2007
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Before 2008
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From 2008
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| 1
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2
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3
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4
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Returns 0 if the data provided is insufficient
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