diff --git a/src/mimick_csharp_test.py b/src/mimick_csharp_test.py
index 5d4145d..e129524 100644
--- a/src/mimick_csharp_test.py
+++ b/src/mimick_csharp_test.py
@@ -231,33 +231,32 @@ def merge_message(alphabet: DarcKey, medium: DarcKey, client_keys: ClientKeys, m
 
     cmo1_cmo2 = cmo1 << cmo2
 
-    input_cmo1_cmo2 = input_seq << cmo1_cmo2
-    message = alphabet < input_cmo1_cmo2
+    a_i = alphabet < input_seq
 
     ncmo2_ncmo1 = ~cmo1_cmo2
 
     if msg_len < height:
-        message.matrix[ncmo2_ncmo1.matrix[0][msg_len]] = eof_arr
+        a_i.matrix[msg_len] = eof_arr
 
-    mutual_inner_key_3 = mutual_keys.persistent.medium.inner_key_3 << mutual_keys.ephemeral.medium.inner_key_3
-    mutual_outer_key_6 = mutual_keys.persistent.medium.outer_key_6 << mutual_keys.ephemeral.medium.outer_key_6
-    mutual_outer_key_4 = mutual_keys.persistent.medium.outer_key_4 << mutual_keys.ephemeral.medium.outer_key_4
+    mmi3 = mutual_keys.persistent.medium.inner_key_3 << mutual_keys.ephemeral.medium.inner_key_3
+    mmo6 = mutual_keys.persistent.medium.outer_key_6 << mutual_keys.ephemeral.medium.outer_key_6
+    mmo4 = mutual_keys.persistent.medium.outer_key_4 << mutual_keys.ephemeral.medium.outer_key_4
 
-    outer_key_1 = mutual_outer_key_4 << mutual_outer_key_6
+    nmmo6_nmmo4 = ~(mmo4 << mmo6)
 
-    outer_key_1 = ~(ncmo2_ncmo1 << outer_key_1)
+    nmmo6_nmmo4_co1_co2 = nmmo6_nmmo4
 
-    mutual_inner_key_3 = mutual_inner_key_3 < outer_key_1
+    mmi3_nmmo6_nmmo4_co1_co2 = (mmi3 < nmmo6_nmmo4_co1_co2)
 
-    message = medium ^ (message << mutual_inner_key_3)
+    message = medium ^ ((a_i << mmi3_nmmo6_nmmo4_co1_co2) < cmo1_cmo2 )
 
-    mutual_outer_key_5 = mutual_keys.persistent.medium.outer_key_5 << mutual_keys.ephemeral.medium.outer_key_5
-    mutual_inner_key = mutual_keys.persistent.medium.inner_key_4 << mutual_keys.ephemeral.medium.inner_key_2
+    mmo5 = mutual_keys.persistent.medium.outer_key_5 << mutual_keys.ephemeral.medium.outer_key_5
+    mpmi4_memi2 = mutual_keys.persistent.medium.inner_key_4 << mutual_keys.ephemeral.medium.inner_key_2
 
-    mutual_outer_key_4 = ncmo2_ncmo1 << mutual_outer_key_4
-    outer_key_2 = mutual_outer_key_5 << outer_key_1
+    mutual_outer_key_4 = ncmo2_ncmo1 << mmo4
+    outer_key_2 = mmo5 << nmmo6_nmmo4 << cmo1_cmo2
 
-    message = message << (mutual_inner_key < outer_key_2)
+    message = message << (mpmi4_memi2 < outer_key_2)
     message = message < mutual_outer_key_4
     return message