@SuppressWarnings("SpellCheckingInspection")
  private static long mix2Accs(final long acc_lh, final long acc_rh, final int offSec) {
    return unsignedLongMulXorFold(
      acc_lh ^ secretLong[offSec],
      acc_rh ^ secretLong[offSec + 8]
    );
  }
@SuppressWarnings("SpellCheckingInspection")
  private static long mix2Accs(final long acc_lh, final long acc_rh, final int offSec)