1. A system that processes text intervals, comprising: a memory; and a processor configured to execute a plurality of modules stored in the memory; the modules including: a preprocessing module configured to: extract a first proposition from a first text interval; a generation module configured to: provide a plurality of semantic roles, wherein each role of the plurality of roles defines a different semantic relationship between at least two words, generate a first proposition tree from the first proposition, wherein the first proposition tree comprises at least one node connected to other nodes by at least one edge, wherein each node is respectively associated with at least one word from the first proposition, assign at least one of the plurality of roles to the at least one edge; 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, wherein the second text interval is different from the first text interval and at least one of the first text interval and the second text interval comprises natural language, and selectively output the second text interval based on the first similarity value.
4. The system of claim 1 , wherein the matching module is further configured to: determine a second similarity value between the second text interval and the first text interval, find the second text interval redundant to the first text interval in response to the first and second similarity values each exceeding respective thresholds, and refrain from outputting redundant text intervals.