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Definition of Undefined is Missing

Added In the Missing definition of the Undefined variable in Javascript on Line 61.

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Original file line number	Diff line number	Diff line change
`@@ -58,7 +58,7 @@ Output:`
`58`	`58`	`> Error: x is not defined // note that not defined here and "undefined" in sample 2 are totally different.`
`59`	`59`
`60`	`60`	`- Not defined: We have not initialised the value for variable anywhere in the entire code and in memory space.`
`61`		`-- Undefined:`
	`61`	`+- Undefined: It is a placeholder that is assigned to a variable by the Javascript Engine until the variable is assigned with some other value.`
`62`	`62`
`63`	`63`	`__Hoisting__ is a concept which enables us to extract values of variables and functions even before initialising/assigning value without getting error`
`64`	`64`

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