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    \$\begingroup\$ I think $1$2$3$4 -> $0. \$\endgroup\$ Commented Apr 10, 2020 at 13:45
  • \$\begingroup\$ @someone Bah, I spent ages trying to think of ways to simplify all of those $s and yet overlooked the obvious one... \$\endgroup\$ Commented Apr 10, 2020 at 14:00
  • \$\begingroup\$ In fact, I thought about the ages I'd spend trying to simplify all of those $s and decided not to write a Retina answer :) \$\endgroup\$ Commented Apr 10, 2020 at 14:57