Sketch of the classification of multiples. For simplicity, we show a case where all galaxies have the same stellar mass. The three galaxies are denoted with numbers one to three, and the selection criteria (both spatial and spectral) for companions are visualized as dashed (for galaxies 1 and 3) and dotted circles (for galaxy 2), centered at each galaxy. In this case, the number of companions is one for both galaxy 1 and 3, and two for galaxy 2. We classify this system as a triplet.