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And type the libraries in the head section and sabesave.
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Using a plug-in, the lines in the header will remain after any WordPress update if you use this plug-in.
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For header insertion on specific sites, we can also refer here.
For an example page with this setup you can refer here - https://nelsongomez.net/amptest/oppo-working-find-n-fold-and-find/?amp=1