question: public static ICovarianceMatrix serializableInstance ( ) { List < Node > variables = new ArrayList < > ( ) ; Node x = new ContinuousVariable ( "X" ) ; variables . add ( x ) ; TetradMatrix matrix = TetradAlgebra . identity ( 1 ) ; return new CovarianceMatrix ( variables , matrix , 100 ) ; }
target:  Generates a simple exemplar of this class to test serialization.