{HEAD ~ The interface device} includes a field that stores an output knowledge variable, {TAIL ~ input} and local fields that store knowledge variables for operating the output knowledge variables, and a field that stores a computing equation of declarative representation that utilizes knowledge variables using operands as other knowledge variables 
includes
{ HEAD ~ The interface device } includes a field that stores an output knowledge variable , { TAIL ~ input } and local fields that store knowledge variables for operating the output knowledge variables , and a field that stores a computing equation of declarative representation that utilizes knowledge variables using operands as other knowledge variables
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH