set A = the non empty set ;
set P = the Relation of the non empty set ,( the non empty set *);
set I = the Element of the non empty set ;
take
GrammarStr(# the non empty set , the Element of the non empty set , the Relation of the non empty set ,( the non empty set *) #)
; not GrammarStr(# the non empty set , the Element of the non empty set , the Relation of the non empty set ,( the non empty set *) #) is empty
thus
not the carrier of GrammarStr(# the non empty set , the Element of the non empty set , the Relation of the non empty set ,( the non empty set *) #) is empty
; STRUCT_0:def 1 verum