The Ririe-Woodbury Dance Company has opened its 2012/2013 season on a bittersweet note with Four.  This show marks the official countdown to the exit of artistic director Charlotte Boye-Christensen.  This scheduled departure gives the company and Salt Lake City an opportunity to reflect on and appreciate the tremendous creativity and personal commitment Boye-Christensen has brought to local dance over the last decade, while she is still with us in her capacity as director.  Still, it’s hard not to hear a ticking clock set the cadence for the various pieces that comprise this show.  The challenge this production offers, then, is that of maintaining a cool attitude regarding the passage of time.