8. The system of claim 6 , wherein the plurality of multi-word sequences include adjacent word pairs and adjacent word triples, and wherein the processing system, in the determining of the third numerical measure, is configured to execute steps comprising: 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.
8. The system of claim 6 , wherein the plurality of multi-word sequences include adjacent word pairs and adjacent word triples, and wherein the processing system, in the determining of the third numerical measure, is configured to execute steps comprising: 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. 9. The system of claim 8 , wherein the processing system, in the processing of the PMI values for the adjacent word pairs and the adjacent word triples to determine the third numerical measure, is configured to execute steps comprising: 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.