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  • \$\begingroup\$ "because <...> and [...] are still in use." However, you did not remove [...]. Please fix. \$\endgroup\$ Commented Jun 4, 2017 at 20:14
  • \$\begingroup\$ Question: Is [...] really necessary? Pushing 0 can be done at the start with ({}) (but it relies on a empty stack, so 0s will have to be carefully shuffled) The main problem is being able to go down the stack without access to <...> (which can no longer be simulated) \$\endgroup\$ Commented Jun 18, 2017 at 17:47