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2014-10-23T10:20:23+03:00
A=1997 ; b=1997+327=2324 ; c=(1997+2324)-1521=4321-1521=2800 ; d=(1997+2324+2800)-(2800-2324)=(4321+2800)-(2800-2324)=7121-476=6645
4 3 4