The symbol is Lr. It used to be Lw but was changed some years ago.

This chemical symbol (Lr) was proposed by IUPAC.

The acronym LR stands for Long Range.

LALR parsers have an equal number of states as an LR(0) parser. LR(1) parsers have a number of states dependent on the lookahead. Often different states are identical, except they have a different lookahead. i.e.

Sample LR(1) item sets:


1)
A -> B.C,'x'
A -> E.C,'y'


2)
A -> B.C,'g'
A -> E.C,'h'


Equivalent LALR(1) item set:


1)
A -> B.C,'x'
A -> E.C,'y'
A -> B.C,'g'
A -> E.C,'h'


Fewer states means fewer shifts and reduces. And at least as importantly, a much smaller parse table.

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