The court or floor space shall be twenty-five feet wide and fifty feet long, to be divided into two square courts, twenty-five by twenty- five feet, by the net. Four feet from the net on either side and parallel with it shall be a lin e across the court, the Dribbling line. The boundary lines must be plainly marked so as to be visible from all parts of the court. Note--The exact size of the court may be changed to suit the convenience of the place.