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  1. STACK OVERFLOW PROTECTION: To avoid having to check for stack

  2. underflow after each pop operation (which can end up being

  3. prohibitive in terms of costs), we give ourselves a nice 6

  4. bytes buffer. 6 bytes because we seldom have words requiring

  5. more than 3 items from the stack. Then, at each "exit" call we

  6. check for stack underflow.