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    \$\begingroup\$ @Grimy Ah, that first comment is indeed an obvious one. I've just changed it to a character array, so now that indeed works where it wouldn't before when the words were still strings. That second approach of merge, check pair equality, sum is quite brilliant, though! :D Thanks (as always). \$\endgroup\$ Commented Sep 18, 2019 at 12:40
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    \$\begingroup\$ Another -1: ¹€g3@ -> DO2@ after the first check (TIO) \$\endgroup\$ Commented Sep 18, 2019 at 12:47
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    \$\begingroup\$ @Grimy Another nice one, thanks. We're now below the Jelly answer of 29. :) \$\endgroup\$ Commented Sep 18, 2019 at 13:04