Define the rule echo(LST0, LST1). This rule describes LST1, which holds all the same elements as LST0, except that they are all repeated. You should expect LSTO and LST1 to always be nonempty lists. e.g.: echo([a], [a, a]). true ? echo([a, b], [a, a, b, b]). true ? echo([a, b], A). A= [a, a, b, b] ? echo(A, [a, a, b, b]). A= [a, b] ?

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