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  • \$\begingroup\$ Should reverse even line be reverse odd lines instead? \$\endgroup\$ Commented Mar 16, 2016 at 10:20
  • \$\begingroup\$ @nwp index begin at 0 ^^ \$\endgroup\$ Commented Mar 16, 2016 at 11:58
  • \$\begingroup\$ Ah, you are talking about the line numbers, not the length of the line. I confused those, sorry. \$\endgroup\$ Commented Mar 16, 2016 at 12:00
  • \$\begingroup\$ @nwp np, btw I changed it to avoid confusion \$\endgroup\$ Commented Mar 16, 2016 at 12:07