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  • \$\begingroup\$ Just been pondering this some more, I think there is an error in your algorithm: TIO \$\endgroup\$ Commented Sep 14, 2017 at 14:48
  • \$\begingroup\$ @user2390246 I fixed it! I had some misplaced parentheses, but now the diffinv definitely won't work here. \$\endgroup\$ Commented Sep 14, 2017 at 20:04
  • \$\begingroup\$ what about tio.run/##HYy7DsIwEAR/… \$\endgroup\$ Commented Jun 4, 2018 at 1:44