HLRT: Finding r1, l2 and r2
<HTML><TITLE>Some Country Codes</TITLE> <BODY><B>Some Country Codes</B><P> <B>Congo</B> <I</I><BR> <B>Egypt</B> <Iᡌ</I><BR> <B>Belize</B> <I</I><BR> <B>Spain</B> <Iᡚ</I><BR> <HR><B>End</B></BODY></HTML>
r1 can be any prefix l2 can be any suffix