Question: stmt-----------> assignment ----------> subr_call assignment --------> id := expr subr_call --------> id (arg_list) expr -------> primary expr_tail expr_tail -------> op expr --------> E primary --------->

stmt-----------> assignment

----------> subr_call

assignment --------> id := expr

subr_call --------> id (arg_list)

expr -------> primary expr_tail

expr_tail -------> op expr

--------> E

primary ---------> id

----------> subr_call

-----------> ( expr )

op -----------> + | - | * | /

arg_list ----------> expr args_tail

args_tail ----------> , arg_list

-------------->E

write a leftmost derivation for the string foo(a, b)?

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