How do we mix supernova ejecta to reproduce isotopic ratios of presolar grains?

We investigate the mixing ratios of the supernova mixtures reproducing as many as possible of the 12C/13C, 14N/15N, 26Al/27Al, 29Si/28Si, 30Si/28Si, and 44Ti/48Ti isotopic ratios measured in two presolar grains from supernovae. We consider the mixing of seven layers of supernova ejecta, i.e., the Ni, Si/S, O/Si, O/Ne, C/O or O/C, He/C, and He/N layers. Five isotopic ratios of the grains are reproduced by mixtures at the maximum. The mixtures should mainly contain the He/N layer to reproduce 12C/13C and to be the C/O ratio slightly larger than unity. The Ni layer should be included for the grains with high 44Ti/48Ti ratios. Including too much material from O-rich layers is not appropriate because of their small C/O ratios.