Write BNF(Backus-Naur Form) (or EBNF) rules and draw the parse tree for this programming language:

Description:

You may use non-terminal symbols like: < program >, < procedure >, < var-list >, < call-stmt >, < assign-stmt > You may include any other non-terminal / terminal symbols when necessary.

----------------------------------------------------

Language is:

Procedure SubA [Var a,b,c] Var d; Start d = a + b + c - 1; ExitIfZero d; Call SubB; End

Procedure SubB Var a,b; Start a = 4; Print a; End

Procedure Main Var d,e,f; Start d = 1; e = 2; f = 3; Call SubA [d,e,f]; End