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+Sat Sep 29 17:31:04 2007 Yukihiro Matsumoto <matz@ruby-lang.org>
+
+ * array.c (rb_ary_combination): new method to give all combination
+ of elements from an array. [ruby-list:42671]
+
+ * array.c (rb_ary_product): a new method to get all combinations
+ of elements from two arrays. can be extended to combinations of
+ n-arrays, e.g. a.product(b,c,d). anyone volunteer?
+
+ * array.c (rb_ary_permutation): empty function body to calculate
+ permutations of array elements. need volunteer.
+
Sat Sep 29 17:14:44 2007 Yukihiro Matsumoto <matz@ruby-lang.org>
* marshal.c (r_leave): move proc invocation from r_entry() to