DSG can generate the language count-k for some arbitrary k that is, fa 1 n a 2 n : : : a k n g, which makes it extremely powerful, whereas R-MCTAG can only generate count-4.
dSG cannot generate the copy language that is, fww j w 2 g with some terminal al-phabet, whereas R-MCTAG can; this may be problematic for a formalism modeling natural language, given the key role of the copy language in demonstrating that natural language is not context-free Shieber, 1985.