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  • \$\begingroup\$ Apologies, my "golf" was a mirage. Which unfortunately leaves just the +2 for the recursive f. \$\endgroup\$ Commented Feb 21, 2022 at 18:18
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    \$\begingroup\$ Python3, 32 bytes. Takes the splatted input and signals by exit code: tio.run/… (hope I didn't mess up this time): \$\endgroup\$ Commented Feb 21, 2022 at 18:52