00310nam a2200157Ia 4500008004100000020000900041035000900050082001400059100000800073245003500081250000600116260000900122300000900131500000600140650000600146210723s9999||||xx |||||||||||||| ||und||  aNULL  a9912  aNULLBMTG  aMtg 0aMathematical Olympiad Problems  a-  a-b-  aNULL  a0  a-