@@ -0,0 +1,49 @@
+def remove_duplicates(seq: list) -> list:
+    """
+    Remove duplicates from a list while preserving the order of elements.
+
+    Args:
+        seq (list): The input list from which duplicates need to be removed.
+
+    Returns:
+        list: A new list containing only unique elements from the input list.
+    """
+    seen = set()
+    result = []
+    for item in seq:
+        if item not in seen:
+            seen.add(item)
+            result.append(item)
+    return result
+
+
+def list_counts(seq: list) -> dict:
+    """
+    Count the occurrences of each element in a list.
+
+    Args:
+        seq (list): The input list for which counts need to be calculated.
+
+    Returns:
+        dict: A dictionary where keys are unique elements from the list and values are their respective counts.
+    """
+    counts = {}
+    for item in seq:
+        if item in counts:
+            counts[item] += 1
+        else:
+            counts[item] = 1
+    return counts
+
+
+def reverse_dict(d: dict) -> dict:
+    """
+    Reverse the keys and values of a dictionary.
+
+    Args:
+        d (dict): The input dictionary to be reversed.
+
+    Returns:
+        dict: A new dictionary with keys and values swapped.
+    """
+    return {v: k for k, v in d.items()}