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What is difference between lexems and tokens please explain with example
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-    Token: Basic units of a code eg: keyword, operator, and identifier.
-    Pattern: Rule that specifies a token.
-    Lexeme: A set of characters that matches a pattern of a token.
Eg 1: “shiva” is a lexeme that matches a pattern of ‘identifier’ token.

Eg2: "continue” is a lexeme that matches a pattern of ‘keyword’ token.
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