|x| + y2= a T.theodor 2022.5.1
y2= x4 T.theodor 2022.5.1
y2= x2 T.theodor 2022.5.1
x4- y2+8x= 0 T.theodor 2022.5.1
x4-y2=0 T.theodor 2022.5.1
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