https://www.chegg.com/homework-help/questions-and-answers/expression-identifier-expression-apply-identifier-expression-construct-set-lr-1-items-give-q27568792

Followup from the above link.

Merge the sets of items having common cores to give the set of LALR(1) items.

Or the full question is

Consider the following BNF grammar G: expression ::= identifier | ( expression ) | apply identifier to expression

1. Construct the set of LR(1) items for G (the original grammar given above).

2. Merge the sets of items having common cores to give the set of LALR(1) items.