1-800-SHARED-TASKS at RegNLP: Lexical Reranking of Semantic Retrieval (LeSeR) for Regulatory Question Answering. - Jebish Purbey; Drishti Sharma; Siddhant Gupta; Khawaja Murad; Siddartha Pullakhandam; Ram Mohan Rao Kadiyala (COLING Workshops, 2025)