diff --git a/solutions.py b/solutions.py
new file mode 100644
index 0000000..8655b0e
--- /dev/null
+++ b/solutions.py
@@ -0,0 +1,92 @@
+import re
+import pandas as pd
+
+
+def list_comprehension(l1: list):
+    """For input list l1 of integers, return list of elements
+    whose square is less than sum of all elements"""
+
+    sum_l1 = sum(l1)
+    return [elem for elem in l1 if elem * elem < sum_l1]
+
+
+def nested_list_comprehension(l1: list, l2: list):
+    """For input lists l1, l2, return a list of elements common
+    to both l1 and l2."""
+
+    # result = []
+    # for e1 in l1:
+    #     for e2 in l2:
+    #         if e1 == e2:
+    #             result.append(e1)
+
+    result = [e1 for e2 in l2 for e1 in l1 if e1 == e2]
+
+    return result
+
+
+def dict_comprehension(l1: list):
+    """For input list l1 of integers, return a dictionary with
+    keys from l1, and values are squares of keys"""
+
+    result = {e: e * e for e in l1}
+
+    return result
+
+
+def generator(l1: list, l2: list):
+    """For input lists l1 and l2 of integers, return a generator
+    that gives all pairings (e1, e2) of element e1 from l1 and
+    element e2 of l2."""
+
+    for e1 in l1:
+        for e2 in l2:
+            yield (e1, e2)
+
+
+if __name__ == "__main__":
+    l1 = [1, 2, 3, 4]
+    l2 = [2, 4, 6, 8]
+
+    print("\n-------------------\n")
+    print("Inputs:\n")
+    print(f"l1: {l1}")
+    print(f"l2: {l2}")
+    print("\n-------------------\n")
+
+    print("list_comprehension:\n")
+    print(f"Desired output: [2, 4]")
+    print(f"Output        : {list_comprehension(l2)}")
+    print("\n-------------------\n")
+
+    print("nested_list_comprehension:\n")
+    print(f"Desired output: [2, 4]")
+    print(f"Output        : {nested_list_comprehension(l1, l2)}")
+    print("\n-------------------\n")
+
+    print("dict_comprehension:\n")
+    print("Desired output: {1: 1, 2: 4, 3: 9, 4: 16}")
+    print(f"Output:       : {dict_comprehension(l1)}")
+    print("\n-------------------\n")
+
+    print("generator:\n")
+    print("Desired output:")
+    print("  (1, 2)")
+    print("  (1, 4)")
+    print("  (1, 6)")
+    print("  (1, 8)")
+    print("  (2, 2)")
+    print("  (2, 4)")
+    print("  (2, 6)")
+    print("  (2, 8)")
+    print("  (3, 2)")
+    print("  (3, 4)")
+    print("  (3, 6)")
+    print("  (3, 8)")
+    print("  (4, 2)")
+    print("  (4, 4)")
+    print("  (4, 6)")
+    print("  (4, 8)")
+    print("Output:       :")
+    for pair in generator(l1, l2):
+        print(f"  {pair}")