for c being Element of Constructors holds
( ( kind_of c = a_Type implies c in Modes ) & ( c in Modes implies kind_of c = a_Type ) & ( kind_of c = an_Adj implies c in Attrs ) & ( c in Attrs implies kind_of c = an_Adj ) & ( kind_of c = a_Term implies c in Funcs ) & ( c in Funcs implies kind_of c = a_Term ) )