3. The computer-implemented method of claim 2 , further comprising dividing, at the server, the redundant set of the plurality of phrase pairs into two of more subsets based on a number of sub-phrases in each phrase pair of the redundant set of the plurality of phrase pairs, wherein each subset corresponds to a specific number of sub-phrases.
4. The computer-implemented method of claim 3 , further comprising obtaining, at the server, the one or more selected phrase pairs for each subset of the redundant set of the plurality of phrase pairs sequentially from a subset corresponding to a lowest number of sub-phrases to a subset corresponding to a highest number of sub-phrases.