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