From the first, airport security has been an on-again, off-again imperative.
Again the imperative was to return to business as usual as quickly as possible.
Still, the sight of a 25 year old woman lying on a cot, sick with malaria, despite the fact that she owns a treated bed net - left unused because it makes for a hot night's sleep - was a reminder that this disease is still a danger and a killer, and emphasized again the imperative of "education, education, education"!
Andy Murray may never again have an imperative quite so weighty as the one that sits on his shoulders when he walks on to Centre Court today.
And then he invoked, once again, the tautological imperative: "I assure them we're in Iraq because I deeply believe it is necessary and right and critical to the outcome of the war on terror".
He added: "Once again it is imperative that the teacher supply issue is examined honestly and without attempting to hide an impending crisis".
Once again it seems imperative to decide whether and how mind emerges upon, or exists only under, some specifiable and non-universal natural and non-mentalistic conditions or whether mind itself forms a part of the fundamental structure of the world, perhaps in some of the ways panpsychists have suggested.
Once again, empathy is imperative to achieving this goal.
Once again, it is imperative that you withdraw this offensive advertisement.
Comfort has become the imperative again with rave accoutrements like Air Max BWs and sweats, which might have barred you entry from some Paris clubs, becoming a possibility again.
Again, it is imperative that the public understand the difference between "mediation" and what I refer to as an "alternative form of litigation".
