I am quite confused with all of the different cuts of pork. I understand the source of the rib, sirloin and blade chops, but am quite confused on many of the others commonly seen in my grocery store including "center cut boneless chops," "top loin boneless chops," and "center cut top loin chops." Are these all the same thing? My basic understanding so far is that if there is no tenderloin then it's just a loin cut and center refers to the center of the loin. What is the top loin?