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(aba-1)=b2 

(aba-1)2=b4

(aba-1)(aba-1)=b4

ab(aa-1)ba-1=b4

ab2a-1=b4

a(aba-1)a-1=b4

a2ba-2=b4

 

(a2ba-2)2=b8

(a2ba-2)(a2ba-2)=b8

a2b2a-2=b8

a2(aba-1)a-2=b8

a3ba-3=b8

 

(a3ba-3)(a3ba-3)=b16

a3b2a-3=b16

a3(aba-1)a-3=b16

a4ba-4=b16

 

(a4ba-4)(a4ba-4)=b32

a4b2a-4=b32

a4(aba-1)a-4=b32

a5ba-5=b32

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