@Override public ParamsRequestCondition combine(ParamsRequestCondition other){
  Set<ParamExpression> set=new LinkedHashSet<>(this.expressions);
  set.addAll(other.expressions);
  return new ParamsRequestCondition(set);
}

@ Override public ParamsRequestCondition combine ( ParamsRequestCondition other ) { Set < ParamExpression > set = new LinkedHashSet < > ( this . expressions ) ; set . addAll ( other . expressions ) ; return new ParamsRequestCondition ( set ) ; }
returns a new instance with the union of the param expressions from " this " and the " other " instance .
