Question 6004 – Compiler-Design

A shift-reduce parser carries out the actions specified within braces immediately after reducing with the corresponding rule of the grammar.
S → x x W [ print “1”]
S → y [print “2”]
W → S₂ [print “3”]
what is the translation of “x x x x y z z” ?

Correct Answer: B

⇒ 23131
SR is bottom up parser.
Note : Instead of Sz they given S2 and what operation will perform they are not mentioned