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List variable

List variable can store multiple values of single data type in the key: value format. Every single
value in the List variable is uniquely identified by a 'key'. The 'Key' is of type String by default, and
is maintained internally.
List Var is an alias of the attribute List Variable.
Syntax
List Variable : variable Name   : Data type
Where,
is the name of the variable.
is the data type of the variable. It is Optional. If it is specified, a separate Variable
definition is not required. If not specified, a variable definition with same name must be specified.
Example:
[Function : Test Function]
ListVariable : List Var : String

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