solve. it. very quickly.
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4 s.s - 2s -2s +1
2s( 2s -1) -1( 2s -1)
(2s-1)(2s-1)
s= 1/2,1/2
2s( 2s -1) -1( 2s -1)
(2s-1)(2s-1)
s= 1/2,1/2
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