a+b=(1+(-1);0+2)=(0;2)
(0;2)-c=(-1-0;1-2)=(-1;-1)
(-1;-1)
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a+b=(1+(-1);0+2)=(0;2)
(0;2)-c=(-1-0;1-2)=(-1;-1)
(-1;-1)