iterating nexus test

diff --git a/forester/test_data/nexus_test_4_1.nex b/forester/test_data/nexus_test_4_1.nex
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+++ b/forester/test_data/nexus_test_4_1.nex
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+#NEXUS
+
+[!Data from:
+    Young, D. A. 1981. Are the angiosperm primitively vesselless?
+        Systematic Botany. 6:313-330.
+    Character 9 coded "0" for OTU AUST, following Riggins and Farris (1983)
+]
+
+begin assumptions;
+    options deftype = ord;
+end;
+       
+
+  begin  trees;         
+  utree   'tree 0' =(1:0.212481,8:0.297838,(9:0.222729,((6:0.201563,7:0.194547):0.282035,(4:1.146091,(3:1.008881,
+(10:0.384105,(2:0.235682,5:0.353432):0.323680):0.103875):0.413540):0.254687):0.095341):0.079254):0.000000;
+  
+tree "tree 1"= (1:0.212481,8:0.297838,(9:0.222729,((6:0.201563,7:0.194547):0.282035,(4:1.146091,(3:1.008881,
+(10:0.384105,(2:0.235682,5:0.353432):0.323680):0.103875):0.413540):0.254687):0.095341):0.079254):0.000000
+    
+ tree=[&U]((a,b),c); 
+ utree=[&R]((a,b),c,d)     
+ 
+ tree=[&R]((a,b),c,d,e)
+ 
+tree=[&U]((a,b),c); 
+tree=[&R]((a,b));
+ 
+ tree=[&R]
+ 
+ ((a,b),
+ c)
+ 
+ TREE 'tree 8'=[&U]((AA,BB),C C); 
+ tree 'tree 9'=[&R]((a,b),"cc")
+            
+ tree  'tree 10'=[&R]((a,b),c)
+           
+tree  'tree 11'=[&U]((1,2),3);        
+tree 'tree 12'=[&R]
+(
+(aa,bb),c
+c);           
+ 
+ tree 'tree                           13' =[&R]                   
+ 
+ ((a,b),c)
+  
+  
+  tree "tree         14"             =       [&R]          
+  
+     (1:0.212481,8:0.297838,(9:0.222729,((6:0.201563,7:0.194547):0.282035,(4:1.146091,(3:1.008881,   
+     
+(10:0.384105,(2:0.235682,5:0.353432):0.323680):0.103875):0.413540):0.254687):0.095341):0.079254):0.000000   
+
+ tree "tree     15"          =   [&U]           
+           
+ # (,)            
+ #                  
+ #
+                   
+ (1:0.212481,8:0.297838,(9 
+ 
+ 
+            
+     :0.222729,((6:0.201563,7:       
+              0.194547):       
+              
+              0.282035,(4:1.146091,(3:1.008881,  
+              
+(10:0.384105,(2:0.235682,5:0.353432):0.323680)   
+
+
+
+:0.103875):
+
+
+        0.413540):
+              0.254687):0.095341):0.079254):0.000000  
+            
+tree "tree 16"=[&R](1:0.212481,8:0.297838,(9:0.222729,((6:0.201563,7:0.194547):0.282035,(4:1.146091,(3:1.008881,  
+(10:0.384105,(2:0.235682,5:0.353432):0.323680):0.103875):0.413540):0.254687):0.095341):0.079254):0.000000  
+             
+tree "tree 17"=[&U](1:0.212481,8:0.297838,(9:0.222729,((6:0.201563,7:0.194547):0.282035,(4:1.146091,(3:1.008881,  
+(10:0.384105,(2:0.235682,5:0.353432):0.323680):0.103875):0.413540):0.254687):0.095341):0.079254):0.000000;
+                             
+  end;
+   
+   
+    
+     
+     
+      
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