SYN_PQR_X
P_D_SYNDROME(SYN_PQR_D, SYN_PQR_X, x)
Q_D_SYNDROME(SYN_PQR_D, SYN_PQR_X, y);
R_D_SYNDROME(SYN_PQR_D, SYN_PQR_X, z);
Q_SYNDROME(SYN_PQR_X, y);
R_SYNDROME(SYN_PQR_X, z);