การลบแถวที่ไม่ถูกต้อง

# Split _c0 on the tab character and store the list in a variable
tmp_fields = ____(annotations_df['_c0'], ____)

# Create the colcount column on the DataFrame
annotations_df = annotations_df.____('____', ____(____))

# Remove any rows containing fewer than 5 fields
annotations_df_filtered = annotations_df.____(~ (____))

# Count the number of rows
final_count = ____
print("Initial count: %d\nFinal count: %d" % (initial_count, final_count))