Indian equity benchmarks BSE Sensex and NSE Nifty50 are likely to make a flat-to-negative start on the last session of the holiday-truncated trading week. Singapore Exchange (SGX) Nifty futures — an early indicator of the Nifty index — were last seen trading lower by 36 points or 0.2 percent at 17,968 ahead of the opening bell on Dalal Street, in some recovery after falling as much as 52.5 points earlier in the day.