diff --git a/processing/prepare.py b/processing/prepare.py
index c5eabd4..d102f70 100644
--- a/processing/prepare.py
+++ b/processing/prepare.py
@@ -56,17 +56,25 @@ def process(df: pd.DataFrame) -> pd.DataFrame:
     df['words'] = df['name'].str.count(' ') + 1
     df['length'] = df['name'].str.replace(' ', '', regex=False).str.len()
 
+    # Calculate probable_native and probable_surname
     name_split = df['name'].str.split()
     df['probable_native'] = name_split.apply(lambda x: ' '.join(x[:-1]) if len(x) > 1 else '')
     df['probable_surname'] = name_split.apply(lambda x: x[-1] if x else '')
     df['identified_category'] = df['words'].apply(lambda x: 'compose' if x > 3 else 'simple')
     df['identified_name'] = None
     df['identified_surname'] = None
+    df['annotated'] = 0
+
+    # We can assume that if a name has exactly 3 words, the first two are the native name and the last is the surname
+    # This is a common pattern in Congolese names
+    three_word_mask = df['words'] == 3
+    df.loc[three_word_mask, 'identified_name'] = df.loc[three_word_mask, 'probable_native']
+    df.loc[three_word_mask, 'identified_surname'] = df.loc[three_word_mask, 'probable_surname']
+    df.loc[three_word_mask, 'annotated'] = 1
 
     logging.info("Mapping regions to provinces")
     df['province'] = df['region'].map(lambda r: REGION_MAPPING.get(r, ('AUTRES', 'AUTRES'))[1])
     df['province'] = df['province'].str.lower()
-    df['annotated'] = 0
 
     return df
 
diff --git a/prompt.txt b/prompt.txt
index 0f5f4df..2a6c396 100644
--- a/prompt.txt
+++ b/prompt.txt
@@ -4,16 +4,28 @@ Return null if a part cannot be identified. Do not alter the original name or ad
 
 ## Examples:
 ```
-"tshabu ngandu bernard"
+"tshabu ngandu"
 {
   "identified_name": "tshabu ngandu",
-  "identified_surname": "bernard"
+  "identified_surname": null
 }
 
-"tshisekedi wa mulumba"
+"bapite marie"
 {
-  "identified_name": "tshisekedi wa mulumba",
-  "identified_surname": null
+  "identified_name": "bapite",
+  "identified_surname": "marie"
+}
+
+"tshisekedi mulumba jean claude"
+{
+  "identified_name": "tshisekedi mulumba",
+  "identified_surname": "jean claude"
+}
+
+"ilunga wa makuta jean-marie"
+{
+  "identified_name": "ilunga wa makuta",
+  "identified_surname": "jean-marie"
 }
 
 "ntumba wasokadio marie france"