2007/10/08 ver 1.5 1. added r (range) option 2007/09/10 ver 1.4 1. bug fix in ${...}$ 2. operation rank 2006/11/26 ver 1.3c 1. bug fix in empty echo -n in code area 2006/11/19 ver 1.3b 1. bug fix in empty $foo in text area 2006/09/05 ver.1.3a 1. bug fix in multi-lines with tailing '\' 2006/08/23 ver.1.3 1. sequence of dollars: the rule is simplified. 2005/04/16 ver.1.2b 1. bug fix. 2005/02/02 ver.1.2a 1. fix my URL in readme 2. change Brdline() to Brdstr() in rit.c 2004/12/21 ver.1.2