The lien position will be based on the outstanding number of deeds and the order in which they were filed.
In your example, if the first loan had a deed prepared and filed 1/1/10 and there were no other "active" deeds on the books, that is a first lien. If you filed a different deed on the second loan on 2/1/10 (and did not release the 1/1/10 deed), it would be a second lien.
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I can't herd the cats anymore, so I just set up the electric fences and let them fry when they stray out of bounds.