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Essential insights are shared on this website for free. A voluntary contribution would be appreciated very much. In that case, send your voluntary donation to International Bank Account Number (IBAN) NL94 RABO 0156 1557 53 in the name of J.H. Oldenkamp (Business Identifier Code (BIC) = RABONL2U; this is also known as the Society for Worldwide Interbank Financial Telecommunication (SWIFT) code).



Transferring money via PayPal to Johan @ (without spaces) is also possible.



When ordering, also send an e-mail message (link).