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2014-11-07T11:01:53+02:00
2A+A< 15+12
3A<27
A,27/3
A<9
A={0.1.2.3.4.5.6.7.8}

1 5 1
2014-11-07T11:02:28+02:00
2a-12<15-a
2a-12+a<15
3a-12<15
3a<15+12
3a<27
x<27:3
x<9