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You can make each page a parent of one another.
To assign a parent page to a page, navigate to the page you want to assign a parent page too, then in the right sidebar you will see Page Attributes and a dropdown menu labelled Parent, whatever page you selected in that list will become its parent.
So, Solutions will be the parent of Machines and Machines will ...
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you can insert it in single.php.
find the_content; and that is your content, you can insert above or below the_content;
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Combined Example ( Tested in 5.2 )
Step 1:
Frontend Form
<form id="form-password-reset" action="<?php echo wp_lostpassword_url(); ?>" method="post">
<?php wp_nonce_field( 'ajax-resetpassword-nonce', 'security' ); ?>
<div class="text-align-center margin-bottom-32">
<h3 class="...
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