based on this it is possible to include more than one image in opengraph tag. but how to reach this with:
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set_meta('og:image', 'example.com/img/cmsimage.php/1280x1280/xxxx.jpg', 'property');
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set_meta('og:image', 'example.com/img/cmsimage.php/1280x1280/xxxx.jpg', 'property');
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set_meta('og:image', 'example.com/img/cmsimage.php/1280x1280/xxxx.jpg', 'property', false, true);