Ordering of values in a Column

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Ordering of values in a Column

I have a column called Expressionlist, which contains comma separated list of values.I want to order the values in ascending alphabetical order of the values .For example, if the Expressionlist contains "jackal,dog,elephant", the result should be "dog,elephant,jackal", after doing the sorting.How can this be achieved in Teradata?

Thanks in Advance!