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wp-content/themes/twentytwentyone/single.php

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+<?php
+/**
+ * The template for displaying all single posts
+ *
+ * @link https://developer.wordpress.org/themes/basics/template-hierarchy/#single-post
+ *
+ * @package WordPress
+ * @subpackage Twenty_Twenty_One
+ * @since Twenty Twenty-One 1.0
+ */
+
+get_header();
+
+/* Start the Loop */
+while ( have_posts() ) :
+	the_post();
+
+	get_template_part( 'template-parts/content/content-single' );
+
+	if ( is_attachment() ) {
+		// Parent post navigation.
+		the_post_navigation(
+			array(
+				/* translators: %s: Parent post link. */
+				'prev_text' => sprintf( __( '<span class="meta-nav">Published in</span><span class="post-title">%s</span>', 'twentytwentyone' ), '%title' ),
+			)
+		);
+	}
+
+	// If comments are open or there is at least one comment, load up the comment template.
+	if ( comments_open() || get_comments_number() ) {
+		comments_template();
+	}
+
+	// Previous/next post navigation.
+	$twentytwentyone_next = is_rtl() ? twenty_twenty_one_get_icon_svg( 'ui', 'arrow_left' ) : twenty_twenty_one_get_icon_svg( 'ui', 'arrow_right' );
+	$twentytwentyone_prev = is_rtl() ? twenty_twenty_one_get_icon_svg( 'ui', 'arrow_right' ) : twenty_twenty_one_get_icon_svg( 'ui', 'arrow_left' );
+
+	$twentytwentyone_next_label     = esc_html__( 'Next post', 'twentytwentyone' );
+	$twentytwentyone_previous_label = esc_html__( 'Previous post', 'twentytwentyone' );
+
+	the_post_navigation(
+		array(
+			'next_text' => '<p class="meta-nav">' . $twentytwentyone_next_label . $twentytwentyone_next . '</p><p class="post-title">%title</p>',
+			'prev_text' => '<p class="meta-nav">' . $twentytwentyone_prev . $twentytwentyone_previous_label . '</p><p class="post-title">%title</p>',
+		)
+	);
+endwhile; // End of the loop.
+
+get_footer();