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diff --git a/challenge-166/eric-cheung/python/ch-2.py b/challenge-166/eric-cheung/python/ch-2.py
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+++ b/challenge-166/eric-cheung/python/ch-2.py
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+
+## Remarks
+## https://www.geeksforgeeks.org/python-union-two-lists/
+
+arrFile_Dir_A = ["Arial.ttf", "Comic_Sans.ttf", "Georgia.ttf", "Helvetica.ttf", "Impact.otf", "Verdana.ttf", "Old_Font/"]
+arrFile_Dir_B = ["Arial.ttf", "Comic_Sans.ttf", "Courier_New.ttf", "Helvetica.ttf", "Impact.otf", "Tahoma.ttf", "Verdana.ttf"]
+arrFile_Dir_C = ["Arial.ttf", "Courier_New.ttf", "Helvetica.ttf", "Impact.otf", "Monaco.ttf", "Verdana.ttf"]
+
+arrFile_Union = sorted(list(set().union(arrFile_Dir_A, arrFile_Dir_B, arrFile_Dir_C)))
+
+## print (arrFile_Union)
+
+print ("dir_a\t\tdir_b\t\tdir_c")
+
+for elemLoop in arrFile_Union:
+
+    strResult = ""
+    elemOrigLoop = elemLoop
+    elemLoop = elemLoop.replace("/", "")
+    ## print (elemLoop)
+
+    nCount_Dir_A = arrFile_Dir_A.count(elemOrigLoop) + arrFile_Dir_A.count(elemLoop)
+    nCount_Dir_B = arrFile_Dir_B.count(elemOrigLoop) + arrFile_Dir_B.count(elemLoop)
+    nCount_Dir_C = arrFile_Dir_C.count(elemOrigLoop) + arrFile_Dir_C.count(elemLoop)
+    ## print (nCount_Dir_A)
+    ## print (nCount_Dir_B)
+    ## print (nCount_Dir_C)
+
+    if nCount_Dir_A > 0 and nCount_Dir_B > 0 and nCount_Dir_C > 0:
+        continue
+
+    if nCount_Dir_A > 0:
+        strResult = strResult + elemOrigLoop
+    else:
+        strResult = strResult + "\t"
+
+    strResult = strResult + "\t"
+
+    if nCount_Dir_B > 0:
+        strResult = strResult + elemOrigLoop
+    else:
+        strResult = strResult + "\t"
+
+    strResult = strResult + "\t"
+
+    if nCount_Dir_C > 0:
+        strResult = strResult + elemOrigLoop
+    else:
+        strResult = strResult + "\t"
+
+    print (strResult)