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# Before (buggy)
def find_duplicates(items):
seen = set()
for item in items:
if item in seen:
return item
seen.add(item)
return None # returns on first dupe, misses rest
# After (AI-fixed)
def find_duplicates(items):
seen = set()
dupes = []
for item in items:
if item in seen:
dupes.append(item)
else:
seen.add(item)
return dupes # returns ALL duplicatesHow it works
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