Example zoomed-in light curves with BB95 periods (Sect. 4.2) and BBHOP flares (Sect. 4.3) identified. The merged light curves on the left are zoomed-in versions of those shown in Fig. 4. The light curves on the right are their corresponding BB light curves. The gray vertical area on the left shows BB95 periods, which are BBs whose flux density is larger than S_95% (shown as the gray horizontal line in the left). BBHOP flares are shown on the right using green lines, connecting their start to the peak and then to the end BB. Prominent BBHOP flares are further distinguished with a purple or cyan background. The horizontal solid red line in the right panels represents the reference flux density for determining the global amplitude 𝒢 (i.e., S_25%; the dotted lines represent its error). The gray horizontal dotted line in the right plots represents S_75%, which is needed when determining prominent BBHOP flares. We note that CAZJ1635+0907 and CAZJ0131+5545 were determined to be non-variable, and WD140409.96+045739.9 is non-variable by definition. Thus, we did not identify BB95 and prominent BBHOP flares in their light curves.