The latching means 18, 19 have {TAIL ~ guide edges} 20 in their regions facing {HEAD ~ the closing part} 16 
The latching means 18 , 19 have { TAIL ~ guide edges } 20 in their regions facing { HEAD ~ the closing part } 16
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH