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 typedef enum {
    SAF_FSETS_TOP=1,     /* find the top-level from the given set */
    SAF_FSETS_BOUNDARY,  /* find the boundary of the given set */
    SAF_FSETS_SUBS,      /* find the immediate subsets of the given set */
    SAF_FSETS_SUPS,      /* find the immediate supersets of the given set */
    SAF_FSETS_LEAVES     /* find all the bottom most sets in the tree rooted at the given set */
 } SAF_FindSetMode