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    \$\begingroup\$ … and [:(*i.@#=1 i:~+./"1) still feels too long. But \ and \. are a nice fit for this challenge! \$\endgroup\$ Commented Sep 20, 2020 at 3:01
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    \$\begingroup\$ 66 bytes \$\endgroup\$ Commented Sep 20, 2020 at 3:35
  • \$\begingroup\$ @xash, thanks! now 61: tio.run/… \$\endgroup\$ Commented Sep 20, 2020 at 3:39
  • \$\begingroup\$ @xash fwiw I spent some time trying to improve *i.@#=+./"{i:1: but wasn't able to. \$\endgroup\$ Commented Sep 20, 2020 at 6:18