Problem 2 Write the following functions on lists in Scheme. The semantics of the functions is decribed through examples. 1. (define flatten. (lambda (1) (flatten (a ((b) (c d) (e)))))) (a b c d e) (define rev (lambda (l) (rev (a (b) (c d) (e)))) (((((e))) (d c) (b) a) Note: Do llol use the Schenie build-ill function reverse 3. (define double (lambda (1)