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    active galactic nuclei (1)
    bl lacertae objects (1)
    bl lacertae objects: individual (b2 1215+30, ver j1217+301) (1)
    discovery (1)
    galaxies: active (1)
    galaxies: jets (1)
    galaxies: nuclei (1)
    gamma rays: galaxies (1)
    large-area telescope (1)
    multiwavelength observations (1)