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_Willem Mertz _____|
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| | _Johannes Hendrick Merts _|
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| |_Petronella Merts __|
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| | _Jacob van Cooij _______|__
| |_Willemijntje Kooij ______|
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| |_Jannetje van Sonderen _|__
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|--Hendrik Mertz
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| _Jan van Beek ______|
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|_Geurtje van Beek _|
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|_Antje Groenestein _|
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