DES MOINES -- Each time the Exira-Elk Horn-Kimballton girls tied up Turkey Valley at crunch time Thursday, the Trojans had an answer. And so it went: fourth quarter ties at 32, 34, 36, 38, 40 and 42; another deadlock at 44 in overtime. The Spartans knotted the score seven times in all, and only once - in the final seconds of regulation - did the Trojans not score on their very next possession. When this virtual tug-of-war finally ended in the