another field that stores a computing equation of {TAIL ~ declarative representation} that utilizes said knowledge variables, using operands as {HEAD ~ other knowledge variables}; and 
another field that stores a computing equation of { TAIL ~ declarative representation } that utilizes said knowledge variables , using operands as { HEAD ~ other knowledge variables } ; and
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH