Merge remote-tracking branch 'upstream/master'

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diff --git a/challenge-110/abigail/python/ch-2.py b/challenge-110/abigail/python/ch-2.py
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+++ b/challenge-110/abigail/python/ch-2.py
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+#!/opt/local/bin/python
+
+#
+# See ../README.md
+#
+
+#
+# Run as: python ch-2.py < input-file
+#
+
+import fileinput
+
+outputs = []
+
+#
+# Read input, split on commas, build output strings.
+#
+for line in fileinput . input ():
+    fields = line . rstrip () . split (",")
+    if (len (outputs)):
+        for i in range (len (fields)):
+            outputs [i] = outputs [i] + "," + fields [i]
+    else:
+        outputs . extend (fields)
+
+#
+# Print output lines
+#
+for line in outputs:
+    print (line)