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. 2025 Feb 22;25(5):1355. doi: 10.3390/s25051355
B Feature extraction utilizing the 7 channels without C6                          
0. Set HRFx[CR]includesHFx[C];
Set PRFx[CR]includesPFCx[C];
CR[1,2,3,4,5,6,7],C[1,2,3,4,5,7,8];
1. Find Z1,    if    CR1CR7HRFx<6;
>>Z1 = [3, 5, 10, 18, 19, 31, 34, 35, 37, 45, 47, 49, 56];
2. Find Z2 = [1 2 4 6 7 9 11 23 33 36 41 44 46 48 51 60];
3. Find a ID set X0.4 of Fx,    if    CR1CR7PRFx>0.4;
Z3=X0.4Z2;>>Z3 = [2, 4, 9, 46];