In this paper, we select a substrate language S represented in the UD treebanks, and systematically reorder the dependents of some nodes in the S trees, to obtain trees of a synthetic language S .
we choose a superstrate language R V , and write S = S[R V /V] to denote a (projective) synthetic language obtained from S by permuting the dependents of verbs (V) to match the ordering statistics of the R V treebanks.