Test 4: Validating duplicate detection...
Found 42 duplicate groups:
  - Alice Johnson: 0 duplicate(s)
  - Bob Martinez: 0 duplicate(s)
  - Carol White: 0 duplicate(s)
  - David Chen: 0 duplicate(s)
  - Emma Wilson: 0 duplicate(s)
  - Frank Brown: 0 duplicate(s)
  - Grace Lee: 0 duplicate(s)
  - Henry Davis: 0 duplicate(s)
  - Iris Taylor: 0 duplicate(s)
  - Jack Anderson: 0 duplicate(s)
  - Karen Thomas: 0 duplicate(s)
  - Larry Moore: 0 duplicate(s)
  - Monica Jackson: 0 duplicate(s)
  - Nathan Harris: 0 duplicate(s)
  - Olivia Martin: 0 duplicate(s)
  - Paul Garcia: 0 duplicate(s)
  - Quinn Rodriguez: 0 duplicate(s)
  - Rachel Lewis: 0 duplicate(s)
  - Steve Walker: 0 duplicate(s)
  - Tina Hall: 0 duplicate(s)
  - Uma Allen: 0 duplicate(s)
  - Victor Young: 0 duplicate(s)
  - Wendy King: 0 duplicate(s)
  - Xavier Wright: 0 duplicate(s)
  - Yara Lopez: 0 duplicate(s)
  - Zack Hill: 0 duplicate(s)
  - Anna Scott: 0 duplicate(s)
  - Brian Green: 0 duplicate(s)
  - Chloe Adams: 0 duplicate(s)
  - Derek Baker: 0 duplicate(s)
  - Ella Nelson: 0 duplicate(s)
  - Felix Carter: 0 duplicate(s)
  - Gina Mitchell: 0 duplicate(s)
  - Hugo Perez: 0 duplicate(s)
  - Isla Roberts: 0 duplicate(s)
  - John Smith: 2 duplicate(s)
  - Sarah Johnson: 1 duplicate(s)
  - Michael Brown: 1 duplicate(s)
  - Jennifer Davis: 1 duplicate(s)
  - Robert Wilson: 1 duplicate(s)
  - Lisa Anderson: 1 duplicate(s)
  - Thomas Clark: 1 duplicate(s)

✓ All expected duplicate groups found
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: '' (not in standard list)
WARNING: Unusual match reason: 'email_and_name_and_phone' (not in standard list)
WARNING: Unusual match reason: 'email_and_name_and_phone' (not in standard list)
WARNING: Unusual match reason: 'email_and_name_and_phone' (not in standard list)
WARNING: Unusual match reason: 'name_and_phone' (not in standard list)
WARNING: Unusual match reason: 'email_and_name_and_phone' (not in standard list)
WARNING: Unusual match reason: 'name_and_phone' (not in standard list)
WARNING: Unusual match reason: 'email_and_name_and_phone' (not in standard list)
✓ Match reasons look reasonable
SUCCESS: Duplicate detection validated!