public override int GetHashCode()
{
unchecked
{
var hashCode = M11.GetHashCode();
hashCode = (hashCode * 397) ^ M12.GetHashCode();
hashCode = (hashCode * 397) ^ M21.GetHashCode();
hashCode = (hashCode * 397) ^ M22.GetHashCode();
hashCode = (hashCode * 397) ^ M31.GetHashCode();
hashCode = (hashCode * 397) ^ M32.GetHashCode();
return hashCode;
}
}