nl_tokens: Computes the union of this rectangle with another one .
pl_tokens: public Rectangular union ( Rectangular other ) { return new Rectangular ( Math . <mask> ( x1 , other . x1 ) , Math . min ( y1 , other . y1 ) , Math . max ( x2 , other . x2 ) , Math . max ( y2 , other . y2 ) ) ; }