fixed scope of x:??H;
improved final reasoning: fully formal now;
#!/bin/bash## $Id$## psbooklet - rearrange pages of ps file to be printed as booklet (duplex)#psbook "$@" | \ pstops '4:0L@.7(21cm,0cm)+1L@.7(21cm,14.85cm),3R@.7(0cm,14.85cm)+2R@.7(0cm,29.7cm)'