30.0-29.1+29.2-29.3+29.4
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30.0-29.1=0.9
29.2-29.3= -0.1
0.9-0.1+29.4=0.8+29.4=30.2
29.2-29.3= -0.1
0.9-0.1+29.4=0.8+29.4=30.2
Grasper:
thanks
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