The pot bottom 3 has a plurality of outlet ports 6 which, for example, are {HEAD ~ rectilinear slots} running in {TAIL ~ a star shaped manner} 
The pot bottom 3 has a plurality of outlet ports 6 which , for example , are { HEAD ~ rectilinear slots } running in { TAIL ~ a star shaped manner }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL