3 ;;; a set for which duplicates are allowed
6 "element-of-set? will be same program and union, intersection and
7 adjoin-set will differ. element-of-set? has to traverse a bigger
8 list in the worst case of element not in the set. But union is easy,
9 just concat the two sets. adjoin-set also does not require traversing
10 the set thru element-of-set?. Instead it is a simple cons of the new
11 element with the list representing the set."
12 "If the application involves"