| http://www.w3.org/ns/prov#value | - How about $\displaystyle \max_{B_{3,3}\in t\in S} X(t)$? (This is a little non-standard because of issues of (non)ordering that the commenters on your question are pointing out... but I think, even without knowing whether or not your triples or your set are ordered, it is clear what you mean.)
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