In RST-DT, by our count, 7, 321 out of 7, 673 sentences in the training set, 951 out of 991 sentences in the test set, and 1, 114 out of 1, 208 sentences in the doubly-annotated set have a well-formed DT.
3, 032 out of 3, 430 sentences in the instructional corpus have a well-formed DT.