{HEAD ~ The slider} is slidably mounted in the longitudinal slot and protrudes through the oblique slot into {TAIL ~ the transverse slot} 
protrudes into
{ HEAD ~ The slider } is slidably mounted in the longitudinal slot and protrudes through the oblique slot into { TAIL ~ the transverse slot }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL