Index: openacs-4/packages/xowiki/tcl/lcs-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/lcs-procs.tcl,v
diff -u -N -r1.5 -r1.6
--- openacs-4/packages/xowiki/tcl/lcs-procs.tcl	27 Oct 2014 16:42:04 -0000	1.5
+++ openacs-4/packages/xowiki/tcl/lcs-procs.tcl	25 Apr 2018 19:47:48 -0000	1.6
@@ -35,8 +35,8 @@
 
 proc list::longestCommonSubsequence { sequence1 sequence2 } {
 
-  set seta [list]
-  set setb [list]
+  set seta {}
+  set setb {}
 
   # Construct a set of equivalence classes of lines in file 2