Viable Prefix and Handles
https://gatecse.in/lr-parsing-part-2-language-of-ll-and-lr-grammars/
https://gatecse.in/lr-parsing-part-3-lr0-items-and-lr0-parsing/
https://gatecse.in/lr-parsing-part-4-slr-clr-lalr-and-summary/
Part 2: https://gatecse.in/lr-parsing-part-2-language-of-ll-and-lr-grammars/
Part 3 added - important for LR parsing.
Bottom-up Parsing is done with this.
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