Matthew Poole and continuators on Exodus 32:15

15 And Moses turned, and went down from the mount, and the two tables of the testimony were in his hand: the tables were written on both their sides : on the one side, and on the other side were they written.

Not in the inside and outside, which is unusual and unnecessary, but in the inside onely, some of the ten Commands being written on the right hand, and others on the left, not for any mystery, but onely for conveniency of writing.