In one embodiment, a cold storage system for biological samples has one or more freezers, each freezer having one or racks, each rack receiving one or more boxes, {HEAD ~ each box} receiving {TAIL ~ one or more sample containers} 
In one embodiment , a cold storage system for biological samples has one or more freezers , each freezer having one or racks , each rack receiving one or more boxes , { HEAD ~ each box } receiving { TAIL ~ one or more sample containers }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL