TestLabelIndex

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Tests whether an index has been used in a label list

$R = TestLabelIndex($1,$2)

$R = Result
$1 = Index Value
$2 = Label List

Where The result $R is a boolean, 1 is returned if the label index exists, 0 is returned if it doesn't.

The index value $1 can be a value format, it doesn't need to be formatted to the label list.

The label list $2 parameter can either be a label list reference or an attribute formatted to the label list.