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This helper template calculates periods for Austrian certifications, as stated in this source, which was sent by an authority in IFPI Austria.
It returns:
| Before 1988
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Before 2001
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Before April 2002
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Before 2007
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Before 2013
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From 2013
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| 1
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2
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3
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4
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5
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6
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Returns 0 if the data provided is insufficient
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