3. The computer-implemented method of claim 1 , wherein the plurality of multiword sequences include adjacent word pairs and adjacent word triples, and wherein the determining of the third numerical measure comprises: determining a Pointwise Mutual Information (PMI) value for each adjacent word pair of the plurality of multi-word sequences, the determining of the PMI value for an adjacent word pair comprising: determining a probability p(AB) of the adjacent word pair appearing in a well-formed text based on the n-gram dataset, determining probabilities p(A) and p(B) of first and second words, respectively, of the adjacent word pair appearing in a well-formed text based on the n-gram dataset, and determining the PMI value for the adjacent word pair based on log 2 ⁢ p ⁡ ( AB ) p ⁡ ( A ) · p ⁡ ( B ) ; determining a PMI value for each adjacent word triple of the plurality of multi-word sequences, the determining of the PMI value for an adjacent word triple comprising: determining a probability p(A′B′C′) of the adjacent word triple appearing in a wellformed text based on the n-gram dataset, determining probabilities p(A′), p(B′), and p(C′) of first, second, and third words, respectively, of the adjacent word triple appearing in a well-formed text based on the n-gram dataset, and determining the PMI value for the adjacent word triple based on log 2 ⁢ p ⁡ ( A ′ ⁢ B ′ ⁢ C ′ ) p ⁡ ( A ′ ) · p ⁡ ( B ′ ) · p ⁡ ( C ′ ) ; and processing the PMI values for the adjacent word pairs and the adjacent word triples with the processing system to determine the third numerical measure.
4. The computer-implemented method of claim 3 , wherein the processing of the PMI values for the adjacent word pairs and the adjacent word triples to determine the third numerical measure comprises: assigning each of the PMI values for the adjacent word pairs and the adjacent word triples to one of a plurality of bins, each of the bins being associated with a range of PMI values; determining a first metric for the constructed response, the first metric indicating, for each of the bins, a number of PMI values for the adjacent word pairs assigned to the bin; determining a second metric for the constructed response, the second metric indicating, for each of the bins, a percentage of the PMI values for the adjacent word pairs assigned to the bin; determining a third metric for the constructed response, the third metric indicating, for each of the bins, a number of PMI values for the adjacent word triples assigned to the bin; and determining a fourth metric for the constructed response, the fourth metric indicating, for each of the bins, a percentage of the PMI values for the adjacent word triples assigned to the bin.