ADDED   mttroot/mtt/lib/comp/compound/Bicausal/U2B/U2B_abg.fig
Index: mttroot/mtt/lib/comp/compound/Bicausal/U2B/U2B_abg.fig
==================================================================
--- mttroot/mtt/lib/comp/compound/Bicausal/U2B/U2B_abg.fig
+++ mttroot/mtt/lib/comp/compound/Bicausal/U2B/U2B_abg.fig
@@ -0,0 +1,57 @@
+#FIG 3.2  Produced by xfig version 3.2.5-alpha5
+Portrait
+Center
+Metric
+A4      
+100.00
+Single
+-2
+1200 2
+2 1 0 2 0 7 100 0 -1 0.000 0 0 -1 0 0 3
+	 5625 1350 6975 1350 6750 1575
+2 1 0 2 0 7 100 0 -1 0.000 0 0 -1 0 0 3
+	 5400 2925 5400 1575 5625 1800
+2 1 0 2 0 7 100 0 -1 0.000 0 0 -1 0 0 3
+	 1800 3150 3150 3150 2925 3375
+2 1 0 2 0 7 100 0 -1 0.000 0 0 -1 0 0 3
+	 3825 3150 5175 3150 4950 3375
+2 1 0 2 0 7 100 0 -1 0.000 0 0 -1 0 0 3
+	 1800 1350 3150 1350 2925 1575
+2 1 0 2 0 7 100 0 -1 0.000 0 0 -1 0 0 3
+	 3825 1350 5175 1350 4950 1575
+2 1 0 2 0 7 100 0 -1 0.000 0 0 -1 0 0 3
+	 5400 4725 5400 3375 5625 3600
+2 1 0 2 0 7 100 0 -1 0.000 0 0 -1 0 0 2
+	 5400 4725 5625 4725
+2 1 0 2 0 7 100 0 -1 0.000 0 0 -1 0 0 2
+	 5175 3375 5400 3375
+2 1 0 2 0 7 100 0 -1 0.000 0 0 -1 0 0 2
+	 5175 1575 5400 1575
+2 1 0 2 0 7 100 0 -1 0.000 0 0 -1 0 0 2
+	 5400 2925 5625 2925
+2 1 0 2 0 7 100 0 -1 0.000 0 0 -1 0 0 2
+	 3825 2925 3825 3375
+2 1 0 2 0 7 100 0 -1 0.000 0 0 -1 0 0 2
+	 5175 1125 5175 1575
+2 4 0 2 31 7 101 0 -1 0.000 0 0 7 0 0 5
+	 8550 5175 675 5175 675 675 8550 675 8550 5175
+4 1 0 100 0 18 18 0.0000 4 210 390 3465 3240 AF\001
+4 1 0 100 0 18 18 0.0000 4 195 150 5400 3240 0\001
+4 2 4 100 0 18 18 0.0000 4 270 765 1710 3240 SS:[f]\001
+4 1 0 100 0 18 18 0.0000 4 210 405 3465 1440 AE\001
+4 1 0 100 0 18 18 0.0000 4 195 150 5400 1440 1\001
+4 2 4 100 0 18 18 0.0000 4 270 825 1710 1440 SS:[e]\001
+4 1 0 100 0 18 18 0.0000 4 210 780 5400 5085 SS:zz\001
+4 0 4 100 0 18 18 0.0000 4 270 1095 7110 1440 SS:[ef]\001
+4 1 1 101 0 3 20 0.0000 4 165 150 4500 1125 e\001
+4 1 1 101 0 3 20 0.0000 4 165 150 6300 1125 e\001
+4 1 1 101 0 3 20 0.0000 4 165 150 2475 1125 e\001
+4 1 1 101 0 3 20 0.0000 4 315 105 2475 3510 f\001
+4 1 1 101 0 3 20 0.0000 4 315 105 4500 3510 f\001
+4 1 1 101 0 3 20 0.0000 4 315 105 6300 1710 f\001
+4 1 1 101 0 3 20 0.0000 4 315 105 5625 2385 f\001
+4 1 1 101 0 3 20 0.0000 4 225 165 2520 1665 0\001
+4 1 1 101 0 3 20 0.0000 4 225 165 2520 3015 0\001
+4 1 1 101 0 3 20 0.0000 4 225 165 5220 4140 0\001
+4 1 1 101 0 3 20 0.0000 4 225 165 5625 4140 0\001
+4 1 1 101 0 3 20 0.0000 4 225 165 5220 2385 0\001

ADDED   mttroot/mtt/lib/comp/compound/Bicausal/U2B/U2B_lbl.txt
Index: mttroot/mtt/lib/comp/compound/Bicausal/U2B/U2B_lbl.txt
==================================================================
--- mttroot/mtt/lib/comp/compound/Bicausal/U2B/U2B_lbl.txt
+++ mttroot/mtt/lib/comp/compound/Bicausal/U2B/U2B_lbl.txt
@@ -0,0 +1,42 @@
+#SUMMARY U2B: makes a bicausal bond
+#DESCRIPTION Takes e and f from  ports [e] and [f] and gives corresponding
+#DESCRIPTION bicausal bond at port [ef].
+
+## System U2B, representation lbl, language txt
+## File U2B_lbl.txt
+## Generated by MTT on Thu Jul  8 08:38:15 BST 2004
+
+  ###################################### 
+  ##### Model Transformation Tools #####
+  ######################################
+  
+  ###############################################################
+  ## Version control history
+  ###############################################################
+  ## $Id$
+  ## $Log$
+  ## Revision 1.2  2001/07/03 22:59:10  gawthrop
+  ## Fixed problems with argument passing for CRs
+  ##
+  ###############################################################
+
+## Port aliases
+#ALIAS	e	e
+#ALIAS	f	f
+#ALIAS	out	ef
+
+## Argument aliases
+
+## Each line should be of one of the following forms:
+##	     a comment (ie starting with #)
+##	     component-name	cr_name	arg1,arg2,..argn
+##	     blank
+
+## ---- Component labels ----
+
+## Component type SS
+	[e]	SS		external,internal		
+	[f]	SS		internal,external		
+	[ef]	SS		internal,external		
+	zz	SS		0,0
+