1. A system that processes text intervals, comprising: a memory; 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: 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, wherein the second text interval is different from the first text interval, 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 selectively output the second text interval based on at least one of the first similarity value and the redundancy finding.