1. A system that processes text intervals, comprising: a preprocessing module configured to: extract a first proposition from a first text interval; a generation module configured to: generate a first proposition tree from the first proposition, wherein the first proposition tree comprises a set of nodes and a set of edges, and wherein each edge includes a semantic relationship between nodes of the first proposition tree; and a matching module configured to: determine a first similarity value between the first text interval and a second text interval based on a comparison of the first proposition tree and a second proposition tree corresponding to the second text interval, and selectively output the second text interval based on the first similarity value.