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