X3CExact 3-Set Cover
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Given an instance of X3C defined by the set X = {[x.sub.1], [x.sub.2], x x x, [x.sub.3q]} and a collection of 3-element sets C = {[c.sub.1], [c.sub.2], x x x, [c.sub.n]}, we build an instance of minimum hotness tree.
For 951RV these are analyses V3a, V3b, and V3c (Table 2), for glass 951RW these are analyses W3a, W3b, and W3c (Table 3), and for 951RX these are X3a, X3b, and X3c (Table 4).