Identifiers :
Identifier is a name used to identify a variable, function, class or other object.
Identifier is made with combination of lowercase or upper- case letters, digits or an underscore.
Rules To Create :
Identifiers must start with a letter or underscore.
It can not start with a number.
It contains alpha-numeric characters and underscores.
Identifiers are case-sensitive.
We can't used a keyword as a identifier.
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