when a line is connected to side a, multiple telephone lines, within limits, may connect to side b  and thus be connected into a conference with the person on side a.  the function of the tone on side a was to alert those already connected, when somebody called the b side and connected. in writing, only 65.9% of 5th grade pupils demonstrated on grade level skills. it turned out to be a concert—something novel and of high quality." he disappeared from view and was never seen again. 