diff --git a/bae_chat_log_analysis/__main__.py b/bae_chat_log_analysis/__main__.py
index a9f3882..c53e515 100644
--- a/bae_chat_log_analysis/__main__.py
+++ b/bae_chat_log_analysis/__main__.py
@@ -7,20 +7,21 @@ from .token_counter import count_tokens
 SOURCE_FILE = Path("bae_chat_logs/Source/WhatsApp_Bae_Chat.txt")
 REDUCED_FILE = Path("bae_chat_logs/Reduced/WhatsApp_Chat-08-03-2026-reduced")
 
-SPLIT_OPTIONS = {'1': 'year', '2': 'month', '3': 'day', '4': 'none'}
+SPLIT_OPTIONS = {'1': 'year', '2': 'month', '3': 'week', '4': 'day', '5': 'none'}
 
 
 def prompt_split_option():
     print("How would you like to split the chat output?")
     print("  1) By year")
     print("  2) By month")
-    print("  3) By day")
-    print("  4) No split (single file)")
+    print("  3) By week")
+    print("  4) By day")
+    print("  5) No split (single file)")
     while True:
-        choice = input("Enter choice (1-4): ").strip()
+        choice = input("Enter choice (1-5): ").strip()
         if choice in SPLIT_OPTIONS:
             return SPLIT_OPTIONS[choice]
-        print("Invalid choice. Please enter 1, 2, 3, or 4.")
+        print("Invalid choice. Please enter 1, 2, 3, 4, or 5.")
 
 
 def main():
diff --git a/bae_chat_log_analysis/abbreviations.py b/bae_chat_log_analysis/abbreviations.py
new file mode 100644
index 0000000..ad412fe
--- /dev/null
+++ b/bae_chat_log_analysis/abbreviations.py
@@ -0,0 +1,12 @@
+import ast
+from pathlib import Path
+
+ABBREVIATIONS_FILE = Path(__file__).resolve().parent.parent / "abbreviations.txt"
+
+
+def generate_emoji_abbreviations():
+    """Load emoji abbreviation mappings from abbreviations.txt."""
+    text = ABBREVIATIONS_FILE.read_text(encoding="utf-8")
+    # The file contains "EMOJI_ABBREVIATIONS = { ... }" — extract the dict literal
+    _, _, dict_literal = text.partition("=")
+    return ast.literal_eval(dict_literal.strip())
diff --git a/bae_chat_log_analysis/reducer.py b/bae_chat_log_analysis/reducer.py
index 5b20927..94072f1 100644
--- a/bae_chat_log_analysis/reducer.py
+++ b/bae_chat_log_analysis/reducer.py
@@ -1,5 +1,6 @@
 import re
 from collections import defaultdict
+from datetime import date
 from pathlib import Path
 
 import emoji
@@ -24,6 +25,9 @@ def _date_key(month, day, year_short, split_by):
         return str(year)
     elif split_by == 'month':
         return f"{year}-{int(month):02d}"
+    elif split_by == 'week':
+        iso_year, iso_week, _ = date(year, int(month), int(day)).isocalendar()
+        return f"{iso_year}-W{iso_week:02d}"
     else:  # day
         return f"{year}-{int(month):02d}-{int(day):02d}"
 
@@ -31,7 +35,7 @@ def _date_key(month, day, year_short, split_by):
 def reduce_tokens(input_file, output_file, abbreviations, split_by='none'):
     """Replace long usernames and convert emojis to shortened text codes.
 
-    split_by: 'none', 'year', 'month', or 'day'
+    split_by: 'none', 'year', 'month', 'week', or 'day'
     Returns a list of output file paths that were written.
     """
     output_file = Path(output_file)