Suppose r is the term corresponding to the i-th row in F and c is the term corresponding to the j-th column in F. Let c be marked left.
let f ij be the cell in the i-th row and j-th column of F. The numerical value in the cell f ij is the number of phrases found by Wumpus in which the center term was r and c was the unigram closest to r on the left side of r. f ij is the frequency with which r was found in the context c in our corpus.