Three potential WSLQs or quasar-galaxy-quasar projection systems noted during the visual inspection, as well as the J1651-0417. Their SEDs show the similarity between the members in each pair system, with several typical emission lines of the known quasars (black dashed lines with line names) and an optical wavelength region of 3000 Å– 9000 Å (green shaded area) overlapping on the SEDs. The marks and text annotations in the first three pseudo-color images are the same as in Figures 6 and 10, while the four colored circles with center points, along with “SepMax” and “z_ABCD” denote the quadruply lensed quasars, the largest separation in the J1651-0417 (occurs between A and D), and the redshift of this lensed quasar, respectively.