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This helper template calculates periods for Dutch certifications, as stated in NVPI#Certifications
It returns:
| Before 1984
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Before 1992
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Before 2000
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Before 2006
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Before 2008
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Before June 2009
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Before July 2014
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Before October 2015
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Before April 2016
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Before 2018
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Before 2024
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From 2024
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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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7
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8
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9
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10
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11
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12
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Returns 0 if the data provided is insufficient
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