sentences: if an preposition recreation on another object, then one crystal are trilobite
docs: active_matrix_screen is liquid_crystal_display. icon is symbolic_representation. trilobite is arthropod. parabolic_mirror is parabolic_reflector. passive_matrix_display is liquid_crystal_display. sphere is three_dimensional_geometric_shape. temporal_preposition is preposition. parabolic_antenna is tangible_thing. semicolon is punctuation.