Charles Schwab's Kevin Horner discusses a few "clean" charts with clearly established levels that have caught his eye. Shares of Aflac (AFL) are currently testing a horizontal area of support, an uptrend line that has been in play since November as well as its 50-day moving average on Tuesday, Sept. 14, 2021. With so much activity at this level, Horner says he expects to see a move in AFL shortly. Horner's also interested in the S&P 500 Energy Sector ETF (XLE), which has risen about 30% YTD after struggling through 2020, and the specific company Devon Energy (DVN).