Question: ( length ( if ( null ? ( cons z zs ) ) ys ( revapp ( cdr ( cons z zs ) ) (

(length (if (null?(cons z zs)) ys (revapp (cdr (cons z zs))(cons (car (cons z zs)) ys))))={ justification2}(length (if #f ys (revapp (cdr (cons z zs))(cons (car (cons z zs)) ys))))

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