(define-key map ">" 'notmuch-search-last-thread)
(define-key map "p" 'notmuch-search-previous-thread)
(define-key map "n" 'notmuch-search-next-thread)
(define-key map ">" 'notmuch-search-last-thread)
(define-key map "p" 'notmuch-search-previous-thread)
(define-key map "n" 'notmuch-search-next-thread)