Ullman (Compiler Design) Edition 2 Exercise 5.4 Question 6 (Page No. 337)

Question

Modify the SDD of Fig. $5.25$ to include a synthesized attribute $B.le$, the length of a box. The length of the concatenation of two boxes is the sum of the lengths of each. Then add your new rules to the proper positions in the SDT of Fig. $5.26$.