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Asada+2023 : an apparent major merger of two 𝑧 ∼ 5 ultra-low-mass galaxies (𝑀 ∼ 107𝑀) that are doubly imaged and magnified by cluster. both galaxies are experiencing synchronized starburst.  They have subsolar metallicity (0.2Zsun) and are connected by an even more metal poor bridge.  these ultra low mass galaxies are believed to be responsible for reionising the universe. Merger triggered starbursts could be significant contributors to the ionising photon budget of the universe.