- Added solutions by Avery Adams.

- Added solutions by Jaldhar H. Vyas.
- Added solutions by Mark Anderson.
- Added solutions by Luca Ferrari.
- Added solutions by Peter Campbell Smith.
- Added solutions by W. Luis Mochan.
- Added solutions by Paulo Custodio.
- Added solutions by Cheok-Yin Fung.
- Added solutions by E. Choroba.
- Added solutions by Bob Lied.
- Added solutions by Robbie Hatley.
- Added solutions by Matthias Muth.
- Added solutions by Lubos Kolouch.
- Added solutions by Solathian.
- Added solutions by Duncan C. White.
- Added solutions by Kjetil Skotheim.
- Added solutions by Marton Polgar.
- Added solutions by David Ferrone.
- Added solutions by Mariano Spadaccini.
- Added solutions by Robert DiCicco.
- Added solutions by Ulrich Rieke.
- Added solutions by Laurent Rosenfeld.

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diff --git a/challenge-207/robert-dicicco/python/ch-2.py b/challenge-207/robert-dicicco/python/ch-2.py
new file mode 100644
index 0000000000..4327ca5d04
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+++ b/challenge-207/robert-dicicco/python/ch-2.py
@@ -0,0 +1,37 @@
+#!/usr/bin/env python
+'''
+----------------------------------
+AUTHOR: Robert DiCicco
+DATE  : 2023-03-07
+Challenge 207 H-Index ( Python )
+==================================
+'''
+citations = [10,8,5,4,3],[25,8,5,3,3]
+
+def CalcIndex(c):
+    ln = len(c)
+    offset = ln - 1
+    pos = ln
+    while offset >= 0 :
+        if c[offset] >= pos :
+            print("Output: ",pos,"\n")
+            return
+        else :
+            offset -= 1
+            pos -= 1
+
+for c in citations:
+    print("Input: @citations =",c)
+    CalcIndex(c)
+
+'''
+----------------------------------
+SAMPLE OUTPUT
+python .\HIndex.py
+Input: @citations = [10, 8, 5, 4, 3]
+Output:  4
+
+Input: @citations = [25, 8, 5, 3, 3]
+Output:  3
+----------------------------------
+'''