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+#!/usr/bin/env python3
+#
+#
+#       four-sq-permute.py
+#
+#         TASK #2 › Four Squares Puzzle
+#         Submitted by: Mohammad S Anwar
+#         You are given four squares as below with numbers named a,b,c,d,e,f,g.
+# 
+#                       (1)                    (3)
+#                 ╔══════════════╗      ╔══════════════╗
+#                 ║              ║      ║              ║
+#                 ║      a       ║      ║      e       ║
+#                 ║              ║ (2)  ║              ║  (4)
+#                 ║          ┌───╫──────╫───┐      ┌───╫─────────┐
+#                 ║          │   ║      ║   │      │   ║         │
+#                 ║          │ b ║      ║ d │      │ f ║         │
+#                 ║          │   ║      ║   │      │   ║         │
+#                 ║          │   ║      ║   │      │   ║         │
+#                 ╚══════════╪═══╝      ╚═══╪══════╪═══╝         │
+#                            │       c      │      │      g      │
+#                            │              │      │             │
+#                            │              │      │             │
+#                            └──────────────┘      └─────────────┘
+#         Write a script to place the given unique numbers in the square box so that sum of numbers in each box is the same.
+# 
+#         Example
+#         Input: 1,2,3,4,5,6,7
+# 
+#         Output:
+# 
+#             a = 6
+#             b = 4
+#             c = 1
+#             d = 5
+#             e = 2
+#             f = 3
+#             g = 7
+# 
+#             Box 1: a + b = 6 + 4 = 10
+#             Box 2: b + c + d = 4 + 1 + 5 = 10
+#             Box 3: d + e + f = 5 + 2 + 3 = 10
+#             Box 4: f + g = 3 + 7 = 10
+# 
+# 
+# 
+#
+#       © 2021 colin crain
+## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ##
+
+
+from itertools import permutations
+
+
+
+def find_solutions ( lst ):
+    out = []
+    for candidate in list( permutations(lst) ):
+        (v, n) = validate( candidate )
+        if v: 
+            out.append( [candidate, n] )
+    return out
+
+def validate ( lst ):
+    n = lst[0] + lst[1]
+    return ( (n == lst[1] + lst[2] + lst[3] 
+                == lst[3] + lst[4] + lst[5] 
+                == lst[5] + lst[6]), n )
+
+def report ( tup ):
+    (list, n) = tup
+    
+    print(f'''
+    ===============================
+    solution    
+        sum is {n}
+        values:
+    ''')
+
+    letter_values = zip( ['a','b','c','d','e','f','g'] , list )
+    for lv in letter_values:
+        print(f"\t\t{lv[0]} = {lv[1]}")
+        
+    print(f'''
+    ===============================
+    ''')
+
+input    = [1,2,3,4,5,6,7]
+solution = find_solutions(input)
+if len(solution) > 0:
+    for sol in solution:
+        report(sol)