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Magnets help make electricity,and they hold papers on the refrigerator.what is the correct punctuation

Respuesta :

Magnets help make electricity and they hold papers on the refrigerator.
Magnets help make electricity and they hold papers on the refrigerator. 

You can also do: Magnets help make electricity, and they hold papers on the refrigerator. 

Or: Magnets help make electricity. They also hold papers on the refrigerator.