private bool IsParagraphStart(string marker)
{
if (marker == "id") return true;
if (marker == "rem") return true;
if (marker == "p") return true;
if (marker == "b") return true;
if (marker == "d") return true;
if (marker == "q1") return true;
if (marker == "q2") return true;
if (marker == "io") return true;
if (marker == "s") return true;
return false;
}