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  • \$\begingroup\$ Looks like 8 bytes to me. \$\endgroup\$ Commented Jan 13, 2018 at 9:45
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    \$\begingroup\$ if can be a single byte: (,⍕⊢)⌸⍳ \$\endgroup\$ Commented Jan 13, 2018 at 15:06
  • \$\begingroup\$ @ngn That is very clever! Post it as your own. You may indeed count it as a single byte it you write 7 bytes<sup>SBCS</sup>. \$\endgroup\$ Commented Jan 13, 2018 at 20:25