diff --git a/simSequences.py b/simSequences.py
new file mode 100644
index 0000000..f753091
--- /dev/null
+++ b/simSequences.py
@@ -0,0 +1,191 @@
+
+# git clone https://github.uconn.edu/sun13005/sntree.git .
+# git status
+# git add <file name>
+# git commit -am "some message" 
+# git push
+# git log
+# git show fe580563:tree.py > tmp.py --> to extract older version
+import readseq
+import random
+import re, os, itertools, sys, glob
+from itertools import chain
+from math import exp, log
+class node(object):
+    def __init__(self, ndnum):              # initialization function
+        self.rsib = None                    # right sibling
+        self.lchild = None                  # left child
+        self.par = None                     # parent node
+        self.number = ndnum                 # node number (internals negative, tips 0 or positive)
+        self.edgelen = 0.0                  # branch length
+        self.descendants = set([ndnum])     # set containing descendant leaf set
+        self.partial = None                 # will have length 4*npatterns
+        self.state = None
+        self.states = None
+
+
+    def simulateSequences(self, num_sites):
+        self.states = [str]*(num_sites)
+        freq = [0.25, 0.25, 0.25, 0.25]
+        current_states = [ 'A', 'C', 'G', 'T']
+        if self.par is None:
+            
+            for i in range(num_sites):
+        
+                ran_nm = random.random()
+                if ran_nm < freq[0]:
+                    self.state = 'A'
+                    self.states[i] = 'A'
+                elif ran_nm <= freq[0]+freq[1]:
+                    self.state = 'C'
+                    self.states[i] = 'C'
+                elif ran_nm <= freq[0]+freq[1]+freq[2]:
+                    self.state = 'G'
+                    self.states[i] = 'G'
+
+                else: 
+                    self.state = 'T'
+                    self.states[i] = 'T'
+
+        else:
+            for m in range(num_sites):
+                prob = []
+                ran_nm = random.random()
+
+                for i in current_states:
+                    if self.par.states[m] == i:
+                        p = (0.25+0.75*exp(-4.0*(self.edgelen)/3.0))
+                        prob.append(p)
+                    else:
+                        p = (0.25-0.25*exp(-4.0*(self.edgelen)/3.0))
+                        prob.append(p)
+                for i in prob:
+
+                    if ran_nm <= prob[0]:
+                        self.state = 'A'
+                        self.states[m] = 'A'
+                   
+                    elif ran_nm <= prob[0]+ prob[1]:
+                        self.state = 'C'
+                        self.states[m] = 'C'
+
+                    elif ran_nm <= prob[0]+ prob[1]+ prob[2]:
+                        self.state = 'G'
+                        self.states[m] = 'G'
+
+                    else:
+                        self.state = 'T'
+                        self.states[m] = 'T'
+                       
+        return self.states
+
+
+    def __str__(self):
+        # __str__ is a built-in function that is used by print to show an object
+        descendants_as_string = ','.join(['%d' % d for d in self.descendants])
+
+        lchildstr = 'None'
+        if self.lchild is not None:
+            lchildstr = '%d' % self.lchild.number
+            
+        rsibstr = 'None'
+        if self.rsib is not None:
+            rsibstr = '%d' % self.rsib.number
+            
+        parstr = 'None'
+        if self.par is not None:
+            parstr = '%d' % self.par.number
+            
+        return 'node: number=%d edgelen=%g lchild=%s rsib=%s parent=%s descendants=[%s]' % (self.number, self.edgelen, lchildstr, rsibstr, parstr, descendants_as_string)
+        
+
+
+
+def simulate2(preorder, ntax,  num_sites, out):
+    newf = open(out, 'w')
+    newf.write('#nexus\n\n')
+    newf.write('begin data;\n')
+    newf.write('dimensions ntax=%d nchar=%d;\n' % (ntax, num_sites))
+    newf.write('format datatype=dna missing=? gap=-;\n')
+    newf.write('matrix\n')
+    master = {}
+    for nd in preorder:
+        master[nd.number]=nd.simulateSequences(num_sites)
+        if nd.number >0:
+            newf.write('%s  %s\n' % (nd.number, ''.join(nd.simulateSequences(num_sites))))
+    newf.write(';\n')
+    newf.write('end;')
+
+
+
+
+def readnewick(tree):
+    total_length = len(tree)
+    internal_node_number = -1
+
+    root = node(internal_node_number)
+    nd = root
+    i = 0
+    pre = [root]
+    while i < total_length:
+        m = tree[i]
+
+        if m =='(':
+            internal_node_number -= 1
+
+            child = node(internal_node_number)
+            pre.append(child)
+            nd.lchild=child
+
+            child.par=nd
+            nd=child
+        elif m == ',':
+            internal_node_number -= 1
+            rsib = node(internal_node_number)
+            pre.append(rsib)
+            nd.rsib = rsib
+            rsib.par=nd.par
+            nd = rsib
+        elif m == ')':
+            nd = nd.par
+    
+        elif m == ':':
+            edge_len_str = ''
+            i+=1
+            m = tree[i]
+            assert m in ['0','1','2','3','4','5','6','7','8', '9','.']
+            while m in ['0','1','2','3','4','5','6','7','8', '9','.']:
+                edge_len_str += m
+                i+=1
+                m = tree[i]
+            i -=1
+            nd.edgelen = float(edge_len_str)
+        else:
+            internal_node_number += 1
+
+            if True:
+                assert m in ['0','1','2','3','4','5','6','7','8', '9'], 'Error : expecting m to be a digit when in fact it was "%s"' % m
+                mm = ''
+                while m in ['0','1','2','3','4','5','6','7','8', '9' ]:
+
+                    mm += m
+                    i += 1
+                    m = tree[i]
+                nd.number = int(mm)
+                i -= 1
+        i += 1
+
+    return pre
+
+if __name__ == '__main__':
+
+    output_filename = os.path.join('simulated_output.nexus')
+
+    yuletree = '(((1:0.54019,(5:0.40299,10:0.40299):0.13720):0.72686,(6:0.10576,4:0.10576):1.16129):0.42537,(2:0.58122,(9:0.21295,(7:0.16691,(8:0.14622,3:0.14622):0.02069):0.04604):0.36827):1.11120)'
+    
+    preorder = readnewick(yuletree)
+    ntax = 10
+    num_sites = 10000
+    
+    result = simulate2(preorder, ntax, num_sites, output_filename)
+
diff --git a/tree_test.py b/tree_test.py
index c013706..2cbf27e 100644
--- a/tree_test.py
+++ b/tree_test.py
@@ -20,6 +20,7 @@ def __init__(self, ndnum):              # initialization function
         self.edgelen = 0.0                  # branch length
         self.descendants = set([ndnum])     # set containing descendant leaf set
         self.partial = None                 # will have length 4*npatterns
+        self.state = None
 #         self.probsame = 0.0
 #         self.probdiff = 0.0
         
@@ -151,6 +152,74 @@ def allocatePartial(self, patterns):
             print 'Like=', Like
 
             print '**************************************************'    
+    ###############################################################
+    ###############################################################
+
+    def simulateSequences(self, ran_nm):
+        print '*****************START***********************'
+
+#         print self.number
+        freq = [0.25, 0.25, 0.25, 0.25]
+#         ran_num = []
+#         for i in range(8):
+#             u = random.random()
+#             ran_num.append(u)
+#         print 'ran_num=', ran_num
+#         print p[0]
+        current_states = [ 'A', 'C', 'G', 'T']
+        collect = []
+#         r = 0
+        print 'ran_nm=0', ran_nm
+        if self.par is None:
+            def root():
+                if ran_nm < freq[0]:
+                    self.state = 'A'
+                elif ran_nm <= freq[0]+freq[1]:
+                    self.state = 'C'
+                elif ran_nm <= freq[0]+freq[1]+freq[2]:
+                    self.state = 'G'
+                else: 
+                    self.state = 'T'
+#                 print 'self.state', self.state
+ 
+            root2 = root()
+#             print 'ran_num1=', ran_num[r]
+#             print 'ran_num2=', ran_num[r]
+        else:
+            print 'self.number=', self.number
+            print 'ran_nm=', ran_nm
+
+            prob = []
+            for i in current_states:
+#                 print 'self.par.state=', self.par.state
+                if self.par.state == i:
+                    p = (0.25+0.75*exp(-4.0*(self.edgelen)/3.0))
+                    prob.append(p)
+                else:
+                    p = (0.25-0.25*exp(-4.0*(self.edgelen)/3.0))
+                    prob.append(p)
+#             print 'prob=', prob
+#             
+            for i in prob:
+#                 print 'r=', r
+#                 print 'ran_num[r]', ran_num[r]
+                if ran_nm <= prob[0]:
+                    self.state = 'A'
+#                     print self.state
+                elif ran_nm <= prob[0]+ prob[1]:
+                    self.state = 'C'
+#                     print self.state
+                elif ran_nm <= prob[0]+ prob[1]+ prob[2]:
+                    self.state = 'G'
+#                     print self.state
+                else:
+                    self.state = 'T'
+        print self.state
+#         print 'ran_num_other=', ran_num[r]
+               
+        print '********************END**********************************'
+#         print 'ran_num==', ran_num
+
 
     def __str__(self):
         # __str__ is a built-in function that is used by print to show an object
@@ -175,9 +244,23 @@ def __str__(self):
 
 def prepareTree(postorder, patterns):
     for nd in postorder:
-        
         nd.allocatePartial(patterns)
 
+def random1():
+    ran_num = []
+    for i in range(9):
+        u = random.random()
+        ran_num.append(u)
+    print 'ran_num=', ran_num
+    return ran_num
+
+
+def simulate(preorder, ran_num):
+    print 'ran_num_list=', ran_num
+    r = 0
+    for nd in preorder:
+        nd.simulateSequences(ran_num[r])
+        r+=1
 
 def joinRandomPair(node_list, next_node_number, is_deep_coalescence):
     # pick first of two lineages to join and delete from node_list
@@ -350,8 +433,8 @@ def readnewick(tree):
 #         print nd.number
 
 #     print '############################ postorder1 ############################'
-    post = pre[:]
-    post.reverse()
+#     post = pre[:]
+#     post.reverse()
 #     for nd in post:
 #         print nd.number
 
@@ -359,13 +442,13 @@ def readnewick(tree):
 #     for i in range(len(pre)):
 #         print pre[-i-1].number
     
+#     for nd in pre:
+#         print nd.number
     
-    return post
+    return pre
 #     print post
 #     y= getPostorder(root)
 
-#     for nd in pre:
-#         print nd.number
 
     
 
@@ -441,7 +524,7 @@ def calcExpectedHeight(num_species, mu_over_s):
 
 
 if __name__ == '__main__':
-    random_seed = 24223 # 7632557, 12345
+    random_seed = 24553 # 7632557, 12345
     number_of_species = 5
     mutation_speciation_rate_ratio = 0.4 # 0.689655172  # yields tree height 1 for 6 species
     random.seed(random_seed)
@@ -463,12 +546,15 @@ def calcExpectedHeight(num_species, mu_over_s):
     
     yuletree = '(((1:0.03915,5:0.03915):0.387,(4:0.42253,2:0.42253):0.004):0.118,3:0.54433)'
     
-    postorder = readnewick(yuletree)
+#     postorder = readnewick(yuletree)
+    preorder = readnewick(yuletree)
     
 #     for nd in postorder:
 #         print nd.number
-    y =  prepareTree(postorder, readseq.patterns())
-    z = readnewick(yuletree)
+#     y =  prepareTree(postorder, readseq.patterns())
+#     z = readnewick(yuletree)
+    a = simulate(preorder, random1())
+#     print a
 #     for nd in z:
 #         print nd.number, nd.edgelen
 #         for nd in postorder: