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How many view eloquent serial schedule are possible?

S:w1(a)r2(a)w3(a)r4(a)w5(a)r6(a)
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I think one T1->T2->T3->T4->T5->T6
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no its more than one ...and plz give proper permutation if you got the ans....
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there are two possibilities from this schedule for view serialization . 1> 2> 3> 4> 5> 6  and 3> 4> 1> 2> 5> 6
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