Class Three: The first Luchos were מכתב they were not written onto the Luchos, the Luchos were simply made with them on them. The second Luchos were כתב written onto the stone. In both cases it is carved. The idea of אותיות החקיקה and אותיות הכתיבה and אותיות על פה and what they mean in terms of the oneness between G-dliness and worldliness. 1) Fire and fuel are One ממש and 2) and fire and fuel are separate but in harmony, 3) and the fire and fuel are struggling against each other. The resultant difference was, that in the first Luchos: 1) there could be no forgetfulness, the nature of memory and forgetfulness is discussed here. 2) There could be no submission to other nations.