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9.5.4 Lewd or Filthy Matter Obscene, lewd, lascivious, or filthy publications or writings, or mail containing information on where, how, or from whom such matter may be obtained, and matter that is otherwise mailable but that has on its wrapper or envelope any indecent, lewd, lascivious, or obscene writing or printing, and any mail containing any filthy, vile, or indecent thing is nonmailable (18 USC 1461, 1463)