Instanton dominance over <i>α</i><sub><i>s</i></sub> at low momenta from lattice QCD simulations at <i>N</i><sub><i>f</i></sub> = 0, <i>N</i><sub><i>f</i></sub> = 2 + 1 and <i>N</i><sub><i>f</i></sub> = 2 + 1 + 1
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