{HEAD ~ The oblique slot} is formed on {TAIL ~ the front surface} and communicates with a chamber of the base 
is formed on
{ HEAD ~ The oblique slot } is formed on { TAIL ~ the front surface } and communicates with a chamber of the base
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH