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sorry to bother you but I want to d

sorry to bother you but I want to d

sorry to bother you but I want to d

sorry to bother you but I want to do the following:
(define (truth-table e)
(map (lambda (var) (list var (compute e var)))
(get-table (P e))))

the function get-table, P and compute separately work well...so for doing the final step with above part I keep getting:
argument not a pair for ex:
(truth-table '(or (not a) (and a b #t)))

Can you help me figure it out specifically?
Also how do I turn the lambda function above to a let function I keep getting illegal form...

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