Combination of searches for Higgs boson decays into a photon and a massless dark photon using pp collisions at ?s = 13 TeV with the ATLAS detector - Aad, G.; Aakvaag, E.; Abbott, B.; Abdelhameed, S.; Abeling, K.; Abicht, N. J.; Abidi, S. H.; Aboelela, M.; Aboulhorma, A.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; et al. (JOURNAL OF HIGH ENERGY PHYSICS, 2024)