Question: Write a swi prolog definition for unecho. if parameters are marked with + your definition must always terminate if the agrument contains no variables. if

Write a swi prolog definition for unecho. if parameters are marked with + your definition must always terminate if the agrument contains no variables. if the paremters is ? you must produce results if the argument is a term or a variable. 
unecho(+L1, ?L2) True if L1 and L2 are lists, and any consecutive repetitions in L1 are single elements in L2. ?- unecho([1,2,2,3], [1,2,3]). true. ?- unecho([1,2,2,3], X). X = [1,2,3].

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