<index type="bf.creator">?work bf:creator ?c .
?c bf:label %v FILTER(contains(%v, %s))</index>
<index type="bf.subject">?work bf:subject ?subject .
<index type="bf.creator">?work bf:creator ?c .
?c bf:label %v FILTER(contains(%v, %s))</index>
<index type="bf.subject">?work bf:subject ?subject .