_	the set element names are the file containment names
ffl	the set element names are the file containment names
f	the set element names are the named files
c	the set element names are the checksums of the named files
z	the set element names are the zsums of the named files
fflz	the set element names are the file containment names AND their zsums
dosi	the set element names are the document similarities of the named files
h	the set element names are the entropies of the named files
c	the set element names are the checksums of the named files
fc	the set element names are the named files AND their checksums
fflc	the set element names are the file containment names AND their checksums
fflmtm	the set element names are the file containment names AND their modification time
mtm	the set element names are the modification times of the named files
fmtm	the set element names are the named files AND their modification times
d	the set element names are the containment path of the named files
dmtm	the set element names are the containment path AND the modification times of the named files