Explain how the following Scheme functions operate. What are the targets of their computation? (define (mem x L) (cond ((null? L) #f) ((equal? x (car L)) #t) (define (ins x L) (if (mem x L) L (cons x L))) (define (mer fst snd) (cond ((null? fst) snd) ((null? snd) fst) (else (let ((x (car fst)) (y (car snd))) (if (