"a" gnus-summary-post-news
"x" gnus-summary-limit-to-unread
"s" gnus-summary-isearch-article
- "t" gnus-summary-toggle-header
+ "t" gnus-article-hide-headers
"g" gnus-summary-show-article
"l" gnus-summary-goto-last-article
"v" gnus-summary-preview-mime-message