The floor panel 18, wherein {HEAD ~ said locking surface} of the recess is located in the portion of said lower lip at {TAIL ~ an area} that is disposed distally beyond said upper lip 
is located at
The floor panel 18 , wherein { HEAD ~ said locking surface } of the recess is located in the portion of said lower lip at { TAIL ~ an area } that is disposed distally beyond said upper lip
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH