! Obtain the sequence of the sums of two sequences.
! E.g.:
!   Input:  { 1 2 3 } { 4 5 6 }
!   Output: { 5 7 9 }

! Newbie's broken code:
1 3 [a,b]
4 6 [a,b]
[ + ] 
map

! Question: How can I make "map" accept both sequences and not only one?