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package Interface;
class IdentityRelation {
  String fieldname1;
  String fieldname2;

  public IdentityRelation(String fieldname1,String fieldname2) {
    this.fieldname1=fieldname1;
    this.fieldname2=fieldname2;
  }
  public String toString() {
    return fieldname1+"."+fieldname2;
  }

  public int hashCode() {
    return fieldname1.hashCode()^fieldname2.hashCode();
  }

  public boolean equals(Object obj) {
    if (obj instanceof IdentityRelation) {
      IdentityRelation ir=(IdentityRelation) obj;
      if (fieldname1.equals(ir.fieldname1)&&
          fieldname2.equals(ir.fieldname2))
        return true;
    }
    return false;
  }
}