[two versions]
submitted but not authored by: L.Metcalfe@cm.cf.ac.uk (L Metcalfe)
----8<------------------------------------------------------------------------
____ ____ ___ ____
|Y\ /Y| ________ ________ ______ ________ _________ |YI |Y|
||\\ //|| |>----<| |>----<| /\ |>---<\ |>----<| |\-----/| ||| |||
||\\Y//|| ||T___\! ||T~~~\! //\\ ||T~~\\\ ||T___\! |/~TYT~\| ||l___|||
|||\Y/||| ||<-<] ||| ___ ///\\\ ||| ||| ||<-<] ||| ||<--->||
||| Y ||| ||l_____ ||l__|Y| //<==>\\ ||l__/// ||l_____ |||MAT |||~~~|||
||| ||| |^----<| |^--->|| ///~~~~\\\ |^---