solution to 2.60

diff --git a/src/sicp/ex2_60.clj b/src/sicp/ex2_60.clj
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+++ b/src/sicp/ex2_60.clj
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+(ns sicp.ex2_60)
+
+;;; a set for which duplicates are allowed
+
+(comment
+  "element-of-set? will be same program and union, intersection and
+   adjoin-set will differ. element-of-set? has to traverse a bigger
+   list in the worst case of element not in the set. But union is easy,
+   just concat the two sets. adjoin-set also does not require traversing
+   the set thru element-of-set?. Instead it is a simple cons of the new
+   element with the list representing the set."
+  "If the application involves"
+  )
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