get the count of minimum cycles

gistfile1.txt

select count (distinct ?cyc)
from <http://bio2rdf.org/rna_cycles_pdb>
where{
?a a <http://bio2rdf.org/pdb_vocabulary:Experiment>.
?mcb <http://bio2rdf.org/narf_vocabulary:derived_from> ?a.
?mcb <http://bio2rdf.org/narf_vocabulary:has_member> ?cyc.
}