In SICP 2nd Edition section 2.2.3, the authors have the following code:(define (even-fibs n)  (accumulate cons              nil              (filter even?                      (map fib                           (enumerate-interval 0 n)))))My question is why did they use accumulate in this case? Couldn't they have got the same answer from  filter  without using accumulate?
SICP - Why use accumulate with cons when filter already passes back a list
scheme;sicp
In that section of the book, filter, map, and enumerate-interval are presumed to return sequences, which are conceptually distinct from lists. You can implement sequences using streams, for example, though you can implement sequences using lists too.So, in this case, the accumulate with cons is to convert the sequence to a list.