public java.util.Collection < ? extends TYPE_1 > METHOD_1 ( ) { <BUG> java.util.Set < TYPE_1 > VAR_1 = new java.util.HashSet < > ( ) ;VAR_1 . add ( position ) ;return VAR_1 ;</BUG> }
public java.util.Collection < ? extends TYPE_1 > METHOD_1 ( ) { return null ; } 
