6.. The following is a grammar for JH-Lisp 2.1, modified version of the language you encountered in homework 4, with slightly different syntax, and expanded set of functions. It uses underscores...

Extracted text: 6.. The following is a grammar for JH-Lisp 2.1, modified version of the language you encountered in homework 4, with slightly different syntax, and expanded set of functions. It uses underscores rather than spaces, square brackets rather than parentheses, and words as function names instead of symbolic operators. S → [0.E_E] E → [0.E.E]|N N → 0|1|2|3|4|5|6|7|8|9|NN 0 → add|sub|mul|div|mod|shl|shr Create a PDA that recognizes JH-Lisp 2.1.