Sample39 was not adjusted when Defined Name support was changed to include both relative and absolute addresses. As a result, the Xlsx output is currently incorrect. The Xls output is in even worse shape, since PhpSpreadsheet 'Cannot yet write formulae with defined names to Xls' (see Writer/Xls/Parser.php). (Working around that restriction was the reason for my first contribution to this project.) The sample is changed to define its named ranges properly, and to produce only Xlsx output.
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