x^2+y^2+z^2=a^2

[x-a/2]^2+y^2+z^2=[a/2]^2

[x+a/2]^2+y^2+z^2=[a/2]^2

x^2+y^2+[z-2*a/3]^2=[a/3]^2

x^2+y^2+[z+2*a/3]^2=[a/3]^2

x^2+[z]^2+[y-2*a/3]^2=[a/3]^2

x^2+z^2+[y+2*a/3]^2=[a/3]^2

Graph of the formula

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