Question: 4. Give unambiguous grammar for nested if-then-else structure. Using the same unambiguous grammar show how we can parse the following structure of if then else

4. Give unambiguous grammar for nested if-then-else structure. Using the same unambiguous grammar show how we can parse the following structure of if then else statement:

If E1 then

If E2 then S1

else

if E3 then S3

else S4

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