000			00297nam a22001577a 4500
003			OSt
005			20251030160513.0
040			_cNNL
041			_aEng
082			_a372.7 _bSu169 2007
245			_aSubtraction
260			_c2007
300			_a24 p.
650			_aMathematics
942			_cCS
999			_c121534 _d121534